Summary: Powder Coating
Full of details for powder coating rims, custom powder coating, motorcycle powder coating and review of powder coating equipment
My god, I almost feel like I've abandoned you guys in the powder
coating blog. I just wanted to pop in and drop a note that I've
just been extremely busy at our shop. My rookie (who is also my
right hand man) has left and went to school up at wyotech, so I am
without the one person I could depend on to take care of some of
the load of grunt work. I haven't even had a chance to get around
to doing any powder coating lately (since it's not my main
business) and have been swamped with 12 volt installs and car audio
accessories lately.
I know I have a lot of readers on here in the short time this site
has been active, and I'm very glad you guys have made this powder
coating blog work. Some time next week I'm going back to the ole
garage to do some more powder coating on wheels, so will finally
have a full, step by step guide to powder coating wheels.
In the mean time, if anybody stops by the powder coating blog and
is remotely good with graphics, it would be a huge help if someone
could design an image banner for the site. You'll get due credit
for your work, I have just come to the conclusion that while I'm
incredible at custom powder coating, I can't make an image look
good on a computer to save my life, so I'm at your mercy :).
I'll have some new updates soon though, including a very cheap easy
to setup powder coating system for larger items, as well as some
tips for preparations on them and all too.
Date Published: Oct 02, 2008 - 10:48 pm
Ok, so I've touched on some of the basics of powder coating
equipment up until this point. Today I'm going to break down the
different models of guns that are available to people getting
started with powder coating, their benefits, and drawbacks compared
to their competition.

The very first
powder coating gun I ever began working with was a Chicago Electric
System from Harbor Freight. I was actually really pleased with this
unit to start with and it definitely got the job done. Lack of
adjustable voltage was it's major downfall, and I wasn't a big fan
of the top loading cups, but they worked extremely well. For a
beginners powder coating equipment, it's straight forward, easy to
use, and cleans up fairly fast. I found the foot pedal to be
slightly clunky, and the manufacturer posts no information on it's
power output so I decided to try something different.

My next choice was Eastwood's HotCoat
Powder Coating Gun. Again, as beginner powder coating equipment,
this is a great unit, and Eastwood is a wonderful company to work
with. I have never had issues with them. A major drawback of this
system is again, the lack of a voltage adjustment, which will
really hinder your powder coating equipment with it's ability to
apply multiple coats of powder. I did however find this unit easier
to work with by mounting the thumb switch to the gun itself so that
it was 1-handed operation. While this unit is still in use by me
today, I will be upgrading to one of the later units very shortly.
Again, powder coating equipment with no voltage adjustment will
really hinder your ability to do multiple coats, and will require
'hot flocking' in order to apply top coats and clear coats. This
has worked very well for me before, but a few powders need
extremely thin application coats. As for the cost of powder coating
equipment though, both this powder coating gun and the Chicago
Electric powder coating gun both start off at under $80.00

Eastwood also offers a much more expensive
unit, called the HotCoat Pro system. Finally, we start getting into
some of the stats on the powder coating equipment. This unit works
on a 10,000-25,000 volt range, which is adjustable by the user.
This means stronger application for multiple coats and larger
items. Instead of $80.00 though, we're looking at $600.00 for this
gun. I have many friends on powder coating forums that are using
this gun and absolutely love it. Powder coating application is
smooth, and color changes are just as fast as the hobby unit, but
in my personal opinion I feel the next unit is far more powerful
and from a company that is only concerned about finishing
coats.

Finally, we're at the gun I've become
extremely excited about. Looking at the picture, you can see the
gun shares striking similarity with the Chicago Electric setup, and
that's because it is the same exact gun. While I wasn't a HUGE fan
of the top loading setup, I will give it credit in that it was very
efficient at powder coating transfer, and easily one of the best
low budget powder coating equipment setups. Caswell plating has
taken things one step further though, with their high voltage
coating system. At a whopping $230.00 (less then half the price of
the Eastwood unit) this puppy packs an amazing 30,000-50,000 volts.
Furthermore, when you buy this system, you also get their model of
the chicago standard gun as well too for free, which will help you
when you need to get below that 30,000 range for very small parts.
I can't begin to express how powerful this is as far as getting
even coverage on larger pieces, as you will no longer need to hot
flock your items for powder coating top coats and the such.
Stronger voltage also means better adhesion in it's dry form, so
the powder is less likely to blow off as the piece is being
manuevered for curing.
Overall, any of these 4 options are very good choice to get started
with home powder coating, or if you plan on starting a business of
it. Later on I will touch on industrial setups like the nord system
and all, but for now I think this is enough.... and woohoo for
pictures finally :) Guess I should have looked at that compose
section instead of just edit html all the time.
Keep coming back for more information on powder coating equipment
and full details and pics for powder coating wheels
Date Published: Sep 12, 2008 - 8:35 pm
In my previous article, we discussed various situations with
powder coating wheels and how they affected the
wheel after it was cured. It dawned on me today that while yes,
many people have been wondering if it was safe or not, many others
are simply trying to decide which style and what powder coating
system or powder coating equipment to actually do their wheels
with.
Powder coating wheels is pretty simple in the terms of application
and curing, but where the real skill comes in is... what design are
we going for with the wheels. This will largely depend on the wheel
itself just as much as the equipment, but various performance
wheels and standard alloy rims will give a much broader range of
ideas.
At this point, I'm really kicking myself for not knowing how to
crop images and all and put them in here... I swear I will figure
this out soon and upload some, but for now, you're going to take a
visual journey with me as we start powder coating wheels.
The very first part is to look at the wheel you're actually working
with. Is it a forged alloy, a 3 piece modular rim, or a steel rim.
Starting with the steel rims, there really isn't much we can do to
make these bad boys look beautiful, as they're generally just
stamped steel, and for the most part painted or powder coated
black. You could give it some flare, by giving it a red edge around
the exterior of the rim. This is where powder coating wheels can
make the so so and drab wheel turn into something beautiful... and
still be extremely cheap.
Stepping into the forged alloys or even cast alloys, we have a few
different setups we can work with now. Depending on your powder
coating equipment, you may be able to do in upwards of 4-5 colors
on a single rim. This can take a very basic, $60 each alloy wheel
and make them look like a set of rims costing well over $1000.00
for the set. Picture this one with me in regards to powder coating
wheels. You have a standard split 5 star rim (meaning 10 spokes,
but each spoke is paired with another one and running parallel).
There is also a damaged but visible 2" lip going across the wheel,
and a machined inset for the lug holes. Powder coating wheels like
this will seriously take some time, but lets say we're working with
a black car with blue and silver accents. The front of the spokes
can be done in a super jet black, and then masked off. Spray the
sides of the spokes in a royal blue so that straight on it is
completely not noticeable, but as the rims are view from an angle
you now have blue highlights on them. The pronounced lip on the
wheel can be powder coated in a almost chrome like finish, and you
can toss any color you want, or leave it black, on the machined
inset section in the center of the rim. You now have up to 4 colors
on a single rim, and the key to making them look good like this was
in the preparation. If done correctly, people that see your set of
wheels will have an entirely different outlook on powder coating
wheels.
Getting into actually the easiest of the 3 styles to powder coat is
the 3 piece rim. These wheels generally have a center section which
includes the design and the hub, an exterior rim which goes
outwards, and an interior rim which goes inwards. All 3 pieces bolt
together around the edge of the center section, and similarly, they
unbolt as well too. These individual screws give many more
opportunities with powder coating wheels, in the fact that we can
easily powder coat them as well too. With roughly the same example
as above, and now the added screws, we have an option for a 5th
color on a rim. (this doesn't necessarily mean 5 different colors,
just 5 sections to apply different colors too, 2 might be black and
3 might be blue, or however you wish to do it).
Whether you decide on 1 color or 5, powder coating wheels can
breath new life into old and worn out, tarnished and beat up
wheels. I promise you guys I'll have some pics of some of them I
have done in my time up on here soon :)
Date Published: Sep 07, 2008 - 11:44 pm
Lately in my online research to see what some of the most common
questions and misconceptions about powder coating are, I have come
across many people inquiring whether or not powder coating wheels
was safe and reliable. Unfortunately, while I like to make most
things as simple as possible for people to understand, since after
all, this is a beginner/intermediate introduction to powder
coating, this is a not so clear cut answer on this one.
By now everybody should be aware of
how powder coating works and how to properly use
powder coating equipment. Furthermore, people
must really understand how the curing process works.
To start with, and a very important detail in powder coating
wheels, a manufacturers powder coating cure time is not simply bake
for 20 minutes like that turkey you bought from the grocery store
is. The powder coating is not bonding to the air inside of the
oven, but rather the piece that it is sprayed on, and therefore it
is this part that must reach, and maintain the temperature for the
manufacturers cure time, for the powder coating to really flow out
nicely and attach to it. Obviously for small thing parts, you're
not going to be far from that 20 minutes the manufacturer stated,
however when getting into larger items, like when powder coating
wheels, you will really have to pay attention to the part you're
working with before you start the timer on that cure time. This is
a very key part of this powder coating system, but really not the
most important job either in this setup.
Secondly, preparing the part is crucial and many people overlook
this with "You can't see the outer edge of the rim so I don't need
to mask it" syndrome. Fact is, powder coatings strength comes in
the fact that is a shell, completely encompassing the part and
sealing it within. The catch here is that powder coating the entire
outside of the rim can make tire sealing problematic, and also add
significant weight while powder coating wheels. The item should be
properly masked just past the area of the rim the tire bead sits up
against, but not the entire outside rim of it. Furthermore, detail
must be placed inside of the lug holes as well too, leaving the
base, or conical section clean while powder coating wheels,
otherwise the lug nuts will damage it during installation and can
lead to flaking of the powder coat in the effected area. You would
then proceed further with masking off or plugging the item in areas
like the valve stem hole, or possibly the lip of the rim if it were
to stay polished and not have powder coating applied to the rest of
it.
Now that we have tackled those two problems, this is where the key,
and the heavy debates come in on powder coating wheels. Does the
heat from the curing process effect the integrity of the alloys in
the wheel. Long story short, and sparing you of all the nitty
gritty
metallurgy
aspects of it all, yes it can and
it's possible to be quite detrimental to the part. This is where
the main ingredient comes in to success in powder coating wheels,
and it can be a long and time consuming setup.
One of the most important things to remember is that metal just
simply doesn't like to change temperature fast. While powder
coating wheels, it is very important that you slowly and steadily
raise the temperature of the part to it's curing temperature, and
furthermore, that part needs to come back to ambient temperature
very slowly as well too. Quick flashing of heat can make the metal
brittle, and can result in powder coated wheels cracking under
stress. This is not only very detrimental to your reputation as a
powder coating professional, but it is also a big safety concern
and potentially deadly. If you found this site while just searching
about powder coating, I only hope you read this and take the moment
to speak with whoever will be completing your work to make sure
proper procedures are followed to insure the structural integrity
of your rim. If you merely mention this to them and they laugh and
say it will be fine, do yourself a favor and take your work
elsewhere. It's not worth risking a harmful situation because some
idiots are powder coating wheels and have no clue what they're
doing.
This sites activity is picking up, so if you have any questions,
please leave a comment and I will reply within a day or so. I'm
always happy to help out, and frankly, powder coating wheels is a
beautiful modification for any car, I just want you guys to make
sure it is done right :)
Date Published: Sep 05, 2008 - 7:52 pm
I touched on it in my last powder coating article, about stepping
up my powder coating services by expanding to a larger powder coat
oven. The benefits of this are great, as it will allow me to step
away from the smaller, low income pieces, and get into the larger
profits of motorcycle powder coating, more automotive powder
coating, and plenty of other opportunities.
Eventually, I will be upgrading my powder coating gun, but for the
time being it and my sandblast cabinet should suffice, and in a
worst case scenario, I can easily chemically strip and clean
anything larger needing some powder coat paint applied to it.
So lets get into building a powder coating system beyond your
standard home powder coating kit.
To begin with, I will be building a 4' x 4' x 8' structure out of
structural steel framing available at most hardware stores like
Lowes or
Home Depot.
The studs can be bought in either 8' or 10' sections, so naturally
I will be going for the 8' pieces, which I priced at $4.97 a piece.
I will definitely be going with the 4" metal studs so that I can
apply plenty of insulation to the inside of the powder coat oven.
Eventually I would like to be able to cure ceramic coatings in it
as well for turbo manifolds, headers, and items like that which
powder coating generally will not withstand. Anything over 450
degrees is kind of overkill for aluminum powder coating and most
automotive powder coating, but the overhead will be nice so that I
don't need to build another one down the road.
Utilizing the metal studs, the walls will be built with studs every
24 inches. Roughly 16 studs will be used in total, accumulating a
whopping $84.29, and probably about $10-15 bucks for self tapping
screws to assemble it all. Once the frame is built (with one side
being the door naturally... so it's not attached yet) I'll get some
quotes for all of my sheet metal. This will probably be the most
expensive part of the project, as I want to use at least 20ga sheet
metal for the inner and exterior walls. The powder coat oven needs
to be fully skinned, so that it will hold the insulation and keep
energy costs down while I'm curing the powder coating. I have
figured in about $700 for sheet metal work, which will include some
recesses for the heater elements in the bottom. By far, the most
expensive portion of the powder coat oven, but, well you can't
avoid it.
Once the sheet metal is fabricated, I will attach the interior
walls of the powder coat oven but not the exterior. This will allow
me to mount the 3 burner elements, which will run about $45 for the
elements, the 2 light fixtures in the ceiling, which are about $10
total, and I'm also going to fabricate some rack trails and 3
overhead channels to hang from. The rack trails and channel will
all be made out of 90 degree angle iron, or c-channel if it's not
strong enough. The top channels on the powder coat oven will allow
me to hang parts from the top like a frame for motorcycle powder
coating, or a rear end for automotive powder coating, and the 3
removable racks in the middle of the oven will allow me to use it
for valve covers, suspend intake manifolds below it, or any various
small items I'll need to apply powder coat paint too. Also a small
recirculation fan will be installed near the top of the powder coat
oven to give it more of a convection type heating and will allow
the powder coat to warm up evenly across the piece.
After the interior options are added to the oven, I will be
installing the power supply and doing all of my wiring. Other then
the lights, all control will be ran through the control unit. I
found a guy on ebay that sells power control units for custom oven
setups (I forget his name at the moment, just leave a comment if
you really need to find him). I'll test all electronic connections
and make sure that it's working correctly before I button up this
new puppy. The control unit was about $400.00 so figure that into
the costs.
My next supply site is
http://www.mcmaster-carr.com/. I found a few small
casters capable of holding this weight, for $2.00 a piece, $8.00
total. They also have a 3 pack of cam style latches (to lock the
door when not in use) for $4.52, and fiberglass oven rope (to seal
the door to the front of the powder coat oven) for $0.75/foot,
which will cost $18.00. The most important piece they carry for my
new powder coating system though is the roxul mineral wool. I'm
waiting to hear back if the price is per sheet or not, but they
come in 24" x 48" sheets, and 2" thick. I will need to double this
up to insulate the 4" thickness of the new powder coat oven, so I
will need 42 pieces total. The site lists @ 10.67, but from what
I've heard they come 4 to a pack. Even on the high side of things,
the insulation for my powder coat oven will costs $448.14, but
probably quite less then that. Also a piano style hinge for the
right side of the door, at $18.00, and a handle at $2.00 will
finish off most of the perceived costs of this build.
So in my endeavor of expanding my powder coating services, I'm
looking at about $1,680 total. I definitely think this will be a
good investment, and will keep you guys updated as I go further
along my process. I haven't even lifted a finger to start working
on it yet, just planning right now. Hopefully by that time I will
figure out how to add pictures to this powder coating blog... I
mean hey... I'm good at coating, not a web junkie :)
Date Published: Aug 31, 2008 - 12:54 am
So I've been thinking lately while doing this blog. Why not pursue
something I absolutely enjoy, and take it to the next level. It's
fun, I'm very creative, and it's good money once you have enough of
it. At this point, all I've ever used for powder coating was a
cheap oven I bought off of e-bay.
Sure it's gotten the job done, and I've been able to do tons of
small brackets, control arms, and such like that, but I'm ready to
go bigger. I want to be powder coating motorcycle frames, chairs,
entire tables, not just the random parts on my project cars.
With that, over the next few months, I will be building a home-made
powder coating batch oven. I will probably end up building 2, as
the amount of power required to power an oven that would hold say a
car-frame is ridiculous, and that isn't needed at the moment.
My plan at the moment is simple. I'm going to build a powder
coating oven, 4' wide, 4' deep, and 6' tall. This should be enough
to hold a motorcycle or atv frame suspended. I've been over at the
caswell forums recently with their
oven building forum and reading up, and it
really doesn't seem hard for someone of my skill level to put it
together. I'm going to take it one step further though, and have a
sectional divide that I can place inside of it, so that for smaller
items I can run at half power, and only worry about a 4' x 4' x 4'
oven, and remove the expansion when I need to go larger.
Building this oven won't be incredibly cheap, I've estimated having
at least $1,500 into this, but I feel the benefits far outweigh the
cost. If I can get 2-3 bike frame jobs, at $500 a piece, I will
have covered my costs with ease, and everything after that will be
profit for me. It's an investment I'm willing to make though as I
feel the returns will be easily made back on it. Hell even if I
never do a frame, at my standard rate, I could pay for it in a
year.
I will definitely be using this blog to chart my progress on my new
powder coating oven. I'll even have some pictures and the plans I
used in order to get the job done, and also post any of the contact
I come across that make this job easier. I will show how to build
the overhead trolley system I want, plus removable racks for
holding media on a horizontal surface. This should be alot of fun
overall, and I hope you guys stick through for it ;)
Date Published: Aug 24, 2008 - 9:22 pm
The most important thing to learn as a beginner and starting out
with powder coating is a phrase coined from the auto body
industry.
"Any monkey can spray a car, but preparing it correctly so the job
comes out right is the hard part"
That's never been more true then when it comes to powder coating.
Your piece must be meticulous, absolutely spotless, and free of any
contamination for the best job possible. As you start working with
different objects you will spot problem areas that arise with hobby
systems and work around them so that it looks professional. Don't
be disheartened if your first one or two jobs have flaws in them,
just see what caused it, and fix them. That's really all there is
to powder coating!
So lets get started shall we?
Obviously, the first thing you want to do is clean the piece your
powder coating up. If it's greasy, oily, grimey, dirty, you name
it, it needs to be cleaned. Be careful of using anything too
agresive at this point, as leaving an acidic film or something of
that nature on the part can leave you with problems during the
coating process. I generally spray all my parts off with regular
water to remove the big stuff.
At this point, the part may look clean, but you're really not ready
for powder coating yet. Many prepping agents are good at removing
surface impurities you cannot see with your eye, but in my personal
opinion, I prefer sandblasting every piece before coating. Even
areas that look spotless, I go over at least once or twice so that
I'm 100% positive there are no contaminants on the surface. Sand
Blasting is the process of using abrasive sand to basically strip
away the top layer of material, much like sand paper would. If you
do not have a sand blasting setup, you can either purchase a very
cheap setup from a company like harbor freight, or hand sand the
piece, but that is quite often difficult as you're not working on
flat surfaces.
After that, masking and covering any areas that you do not want
powder coated is up. Eastwood sells a very nice system of high temp
silicone plugs and caps that you can use on hose barbs, bolt
threads, and even bolt holes. They also sell specialized high
temperature tape that you can use to mask off gasket areas such as
the flange of an intake manifold being powder coated. A major tip
that I've learned along the way is not to worry about masking off
things like lettering on a valve cover or small raised edges you do
not want powder coating applied to. It's extremely easy to come
back once it's finished and use an orbital sander or something to
remove the powder coat from the raised edges and leave the powder
underneath it perfectly fine.
My next part of the process is a burn-off and pre-heating system
I've been using all along while powder coating. To further purify
the piece, I will place it uncoated in the oven at 450 degrees for
about 20 minutes. This will generally burn off all contaminants,
and also warms the piece up for the coating process. Care must be
taken to slowly raise and lower the temperature of the piece you're
working on so that the sudden changes do not effect the metallurgy
of the part being powder coated. A inexpensive thermal temperature
reader should be used to verify the temperature of the part.
This is where the spraying finally happens! After it's burn-off
session, I remove the part from the oven and let it cool down to
roughly 150-200 degrees. On the inexpensive hobby systems, no
amperage adjustment has given me troubles getting powder to stick
evenly and issues with faraday cage effects. I use this slightly
higher temperature to help adhesion with the powder and the part
that I'm working on. Using this technique while powder coating is
commonly referred to as a hot flash, and that is basically stating
the temperature isn't high enough for the powder to melt, however
it starts to gel just a bit and helps stick to the part. Spray very
evenly, in broad strokes and paying attention to the hard to reach
spots and doing them first. Once your piece is fully coated, remove
the ground strap, and stick it in the oven. Using your infrared
temperature probe, wait for the part to reach the powders optimal
flowout temp and set your timer.
For the highest gloss, smoothest finishes, when the curing process
has completed, turn off the oven and crack the door but not remove
the part. Let the part slowly, over 20-30 minutes come back down to
room temperature. Cooling down too fast I have found lead to cloudy
finishes, or I've also had dust and debris fall into a freshly
coated piece leaving the oven. Inside there's little turbulence,
and the temperature drops a few degrees every minute, instead of
every few seconds.
That's one of your first powder coated pieces step by step right
there. Pick up a powder coating kit and give it a try, it really is
so easy an idiot like me can do it!
Date Published: Aug 22, 2008 - 7:23 pm
You're going to hear me talk about a few companies on this site
that have been extremely good to me as I was starting out. First
and fore-most,
Eastwood Company is the entire reason I got into
this after stumbling across their very cheap powder-coating gun,
and I've used many of their powders with great success. Another
company I have been extremely happy with in regards to supply is
Columbia
Coatings, who lately have been my #1 powder supplier due to a
vast selection of colors and great customer service.
First and fore-most, you're most important piece in powder coating
is the gun itself. Me personally, I started out with Chicago
Electric's powder coating system available from Harbor Freight.
This unit worked well for me over about 2 months before I started
having some issues, and browsing a few other powder coating
communities and forums I was turned onto Eastwood's hot-coat
system, and have never looked back. Both of these guns can be had
for under $100 + shipping, and both will be perfect for the
beginners hobby setup. The Eastwood gun hasn't been perfect, in the
past 3 years I've replaced it twice, but both times were absolutely
hassle free and timely thanks to Eastwood's amazing customer
service.
You will also need a compressed air source to run the gun. These
guns spray at an amazingly low pressure, so a large compressor
isn't required. Generally 5-10psi is ideal for powder coating,
though a few times I have had to turn that up a bit and blast a
part for extra coverage. If you already have a large compressor in
your garage for air tools, that will work fine. In my personal
setup, I installed another regulator at my gun itself, so that I
could use a blow-gun to clean off my work and area before hand, and
then only get 7psi through the gun w/o having to go back to the
compressor.
Curing the piece simply needs some heat. Eastwood also offers a
very nice, portable propane heat lamp type thing-a-majig, but this
should only be used for pieces you couldn't fit in your oven. Using
an open source heat to cure your pieces is not ideal, as #1, it
doesn't cure the entire piece at once, so you have to constantly
move the heat along it, which for the beginner will prove to be
some costly mistakes, and #2, the piece becomes far more likely to
get contaminants in the powder, which will leave blemishes in the
finish. These 2 factors are extremely important in regards to
powder coating. This stuff is not easy to get off by any means, all
that durability and toughness I already mentioned before is true.
Sand-blasting, sanding, it all takes a lot more work to strip
powder coating, so bad in fact some companies have developed
chemicals just for removing it.
As for curing, a simple old house-hold oven will work wonders. I
use a 30" oven I picked up off of
e-bay for about 30 bucks. Currently I'm going to
finish building a much larger custom oven I have made to do
motorcycle frames and the such. It is very important to use a
dedicated oven for this, as the chemicals released during burn-off
on certain pieces that may have oil contamination have been known
by the state of California to produce cancer... like everything
else they've tested. Seriously though, do not share an oven between
powder-coating and food. It's no bueno, I'm positive you'll get
terribly sick, and after all it's just pretty disgusting that 2
days ago you had a 10 year old valve cover in there baking and
today it's a chocolate cake... c'mon now.
That's it. Seriously, that's all you need to actually apply the
powder coat and cure it. It's not all there is to the equation
though, nor is it all the equipment you need to do a top-notch
professional quality job. The majority of the work is in the
preparation of the piece, which is covered on a different page.
Date Published: Aug 19, 2008 - 10:21 pm
It's a lot like painting, with half the mess! Powder Coating has a
few very distinct advantages over conventional paint aside from
it's toughness and durability factors.
The powder particles are a dry, almost dust like consistency
compared to the liquid based paints which have pigments suspended
in a solution that has to dry out. In a clean setup using only one
color, powder coating over spray can actually be recycled and used
again and again until 100% of the powder is used up. In contrast,
once paint is sprayed, it's pretty much there for good, and there's
no looking back.
Powder Coating also supplies the piece with a far thicker coating
then conventional paint, which is a key to it's durability. In
fact, powder coating a piece compared to painting it will result in
it's finish being approximately 10x thicker, and with it's baking
process, or flow out as some call it, it comes out smooth as glass
with absolutely no orange-peel. In some instances though, a person
may want a thinner application on their piece, which a hobby system
will fail to give, but this is where your major corporations with
fluid transfer tanks come in.
Enough about why powder coating is so much better then painting,
lets get into how it really works.
Your specialized powder coating gun has a polarized rod running
through the center of it, which basically charges the powder
particles running past it. The piece that you're working with will
have a ground strap running of it, to basically complete this
'static charge' type situation it's looking for. It's not exactly
static charge, but since this site is built for beginners, I'm
sparing you all the technical jargon in the beginning, we'll get
into that stuff later on once you're up and running. Since the
powder is now positively charged from the gun, and the piece is
holding a slight negative charge from the unit, the powder actually
clings to the piece you're working on. At low air pressures, you
can actually see the powder make turns in mid air to find the path
of least resistance to the ground (i.e. the parts of the piece
you're making with the lightest coating). This significantly
reduces the amount of powder over spray by utilizing up to 95% of
the powder exiting the gun on some systems and settings.
Anything capable of holding a small electrical charge can have
powder applied to it. Some pieces will conduct far better then
others, and more advanced methods such as hot flashing are needed.
You will also un-doubtably run into the dreaded faraday cage effect
eventually with a hobby unit, and later articles will help you with
fixing that.
The act of curing the powder is done by raising the temperature of
the powder coated piece past the flow out temperate of the powder
you're using. This will vary depending on the different types of
powder available, but basically what it boils down to, is melting
that dry powder that is clinging to the part. As the temperature
comes up, the powder melts, and some powders actually re-align
their chemical makeup to add further strength properties to it.
After the part has been heated up for the powder to flow out, it is
removed from it's heat source (often an oven, but can also be heat
lamps) and cooled to room temperature slowly so that the powder and
the piece come down to room temp at the same time.
That's really all there is to how it works, well the basics at
least. There is still a ton of information to learn on different
techniques and applications, as well as different equipment setups
to get you started.
Date Published: Aug 19, 2008 - 9:51 pm
Currently, I've been having a blast powder coating for the past 3
years. I am not a professional shop, nor do I own big money
equipment, but frankly, people love my work. Patience and
preparation are 2 of the things I have learned in my endeavors with
powder coating, but I have picked up so many different tricks by...
well... simply trying them.
Powder Coating has been around for years, and with new hobby style
equipment from companies like
EastWood producing very affortable, extremely
versitle products. Couple that with some great distributors such as
Columbia
Coatings who are just as happy to send you half a pound of
powder to your house as they are 50 to a manufacturer, and you too
can be on your way to a fun, rewarding, and often profitable
hobby.
Turning this hobby into a profit is quite easy once you've gotten
the hang of it, and start up costs are extremely low with very good
returns. You will need some 'equipment' to begin powder coating,
and I use that term very loosely as to what it actually
entails.
Powder Coating has a
TON of uses too, which you will
probably figure out after reading some of the benefits later on.
Personally, I use this mainly for automotive parts, as the finish
is highly more durable and will withstand aging, abrasion, and
chemicals. In the engine bay of my vehicles, I'm constantly
tinkering with them, and years ago when paint was my preferred
method, it would get trashed within months, if not weeks from being
put together. Optionally though, you could use it for hundreds of
other items as well too. Powder Coat your tools to give them a more
unique look, older metal lawn furniture that has seen the ages
rusting away in your backyard will look good as new with a fresh
coat of powder on them. Even some woods can be powder coated with
traditional setups. All it takes is a static charge and some heat
:)
After we get you through some of the basics, we will get into some
of the equipment that makes powder coating happen. I will even show
you how the big companies do this and turn it around incredibly
fast, plus all the tricks to a proper prep job for the best
results. If you stick with me, you should be having professional
looking pieces, and eventually some pretty damn unique designs with
a low cost, easy to use hobby style powder coating kit, or who
knows, may want to turn this into a business yourself.
Date Published: Aug 19, 2008 - 9:02 pm
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Date Published: Aug 19, 2008 - 9:01 pm