First time powder coating

CWLONGSHOT

Well-Known Member
They look great for your first!!!

As Ian said just thin spots in pigment but fully covered & fine!!

Why thin? Could be many things. Here is my advice I didnt see mentioned.

1: CLEAN BULLETS REQUIRED!!
Dont touch them with fingers. Preferably dont quench them. Altho clean water hasnt hurt mine. But keep your greasy fingers OFF! Either wear clean rubber gloves or use a spoon like I do.

2: The powder in the mixing container.
LESS IS MORE!!!! Its amazing how far it goes!! Too much actually INHIBITS application quality!

3: SWIRL NOT SHAKE!
Your attempting to create static electricity. The more contact the bullets make The better chance they have. Beads can help #5 containers can help. Black beads & mixing containers can help. NONE ARE REQUIRED!!

4: GET MESH TRAYS!!!
If you dont wish to bake that way fine. But you MUST sift off excess powders. You will NOT KNOCK OFF POWDER!! Dont worry. Remember NO FINGERS!!!! THAT ABSOLUTELY WILL remove powder!!

5: Use tweezers, Hemostats, Needle nose pliers. NO FINGERS!!!!!!
To transfer bullets to trays or stand up. (If baskets NO SUCH TOOL NEEDED!! Just dump shake ta get one layer & bake)

6: I prefer a water quench straight outta the bake. No better way to soften the BHN of a bullet then ta bake 20/400!!! Quench helps bring hardness back to almost what it would have been before bake.

Here below, is tips a friend of mine posted some time back. Its great info so I saved it. Thank you ( James) GRMPS!!


Not everything is equal in powdercoating.

Powder Coating creates a Polymer coating/shell around the cast boolit
.....a) it helps protect the boolit from the barrel
.....b) it works as a lubricant between the boolit and the barrel
.....c) it protects the user (and user's kids) from the lead

Different atmospheric conditions can limit static or dampen the powder.

1) the powder must be kept dry ----I use double zipper bags in the NW where we get a lot of rain, store my powder in a garage with a gas furnace and WH
2) the boolits must be kept clean --- IF I'm not coating the boolits right away I put them in plastic zipper bags --- NEVER QUENCH before PCing!!!
.....a) baking the boolits will take most of the hardness you gain by quenching out of the boolit
.....b) quenching is a good way to contaminate the boolits so the PC won't stick well
.....c) quenching after PCing gives good results
.....d) touching the boolit with oily hands can/will affect the coating --- wear nitrile/plastic gloves or use a clean spoon or ? to move the boolits

uclR2g1.png


PC can be dried out in an oven KEEP the temperature below 150° F (leaving the container open in an airconditioned room works) IF the PC is lumpy after drying it will quickly become powder again when you start swirl/shaking [I Rarely ever shake the container when PCing -- the containers don't last long when I do and just swirling gives me good results

3) the oven temperature must be checked with an oven thermometer (or 2) and the dial adjusted to where the thermometers read 400°
.....a) the oven temperatures will change with the surrounding air temperature due to location and type of sensor they use
.....b) toaster ovens work but only for smaller loads and have a tendency to have hot spots (some of the boolits can/will melt)
.....c) conventions ovens have been proven best because they have a circulating and the evenly heats all the boolits ---you can safely bake full trays of boolits

4) If the air/atmosphere is really damp you may need to pre-warm the boolits --- I use an oven set at 150° F or you can set a pan of boolits on to of your hot oven
.....a) the boolits must not be hotter than you can comfortably touch with bare hands or you can get PC clumping-- starting to cure

5) not all PC needs BB's/poly pellets to work --- this is a trial and error thing

6) polyester (usually TGIC) PC works best for me, I get better results with higher gloss powders

7) white/light colors generally don't cover well but adding a little of another color usually helps

8) COATING BOOLITS:
.....A) BOWLS
..........1) coating bowls/containers need to be plastic #5 or plastic #2
..........2) larger diameter bowls allow you to swirl/build up static faster thus cool whip bowls do such a good job
..........3) lids: if the bowl doesn't have a screw-on lid make sure you hang onto it or the lid will come open
.....B)STATIC BUILDING MEDIA: Normally cover the bottom of small bowls with 2 layers large bowls with 1 layer
..........1) ASBB (Air Soft BB's) black BB's are proven to work I've found camouflaged BB's that work also. It has to do with the hardness, what the BB's are made out of as to how well they help build static. even nonstatic building BB's will help even out the coating
..........2) Poly pellets normally black or white, haven't found any poly pellets that didn't help
.....C) Boolits:
..........1) use a minimum of 12-15 boolits -- enough to build up static
..........2) maximum no more than 2-3 layers deep in your bowl
.....D) Powder: This will vary on bowl size and number of boolits being coated
..........1)Ziploc Twist 'n Loc, after the BB's are coated, no more than 1 teaspoon per batch see how much PC is left in the bottom of the bowl after coating.
..........2) Cool Whip after the BB's are coated 1-2 teaspoons per batch see how much PC is left in the bottom of the bowl after coating.
..........3) Too much PC will prevent good static build-up
..........4) Too little PC will result in thin/spotty coating --- it's easy to add a little more and swirl a little longer
.....E) blending/mixing different PC is not like dealing with paint, white and black don't always make grey more often you get spotted/splotchy boolits
a) blending/mixing a little good PC with a bad PC often makes the bad PC work
b) blending/mixing multiple PCs can give you amazing results but the results will change with each batch you coat
c) some powders stick faster/better than others, the blend color will be heavier with that color to begin with then taper of when the color is used up in the bowl
.....F) SWIRLING: Screw or hold the lid tight and swirl the bowl holding it flat to verticle and back to flat, continue until all boolit are coated
.....G) preparing coated boolits:
..........1) REMOVE ALL EXCESS POWDER
.................a) Sift PC/boolits/BB's in a colander with something to catch the BB's and powder when they fall through the colander removing all excess PC
........................1) after all the PC/BB's are sifted off pick up the boolits with tweezers or fingers wearing surgical gloves (dipped in pc first to prevent sticking)
.................b) Pick up- dump PC'd boolits in a tray or? pick them up with tweezers, tap the tweezer on the side of a container to remove all excess PC
.....H) preparing to bake: Use a pan lined with non-stick paper/foil/bake mats or screen (1/4 hardware cloth)/wire basket (office supply)
..........a) stand short fat boolits up on their bases using finger or tweezer method
..........b) place taller boolits in silicone ice cube trays or use a metal grid to keep them from falling over
..........c) Dump method dump the sifted boolits in screen (1/4 hardware cloth)/wire basket (office supply) [this doesn't work well with all PC's you can get bad sticking
9) Baking PC the manufacturer states Bake for XX minutes at XXX° AFTER this condition exists
.....a) bake for XX minutes AFTER the boolits have reached XXX°
.....b) bake for XX minutes AFTER the PC starts to flow on the boolits
.....c) PC will look good after it flows and may pass the smash test BUT unless bakes to factory specifications IT IS NOT FULLY CURED
*****I have found that baking the coated boolits in an oven preheated to 400° for 25 minutes meets or exceeds all manufacturers requirements*****

10) Testing PC for adhesion/sticking using a smooth-faced hammer
.....a) flatten the PC'd cool boolit to 1/2 its original height seeing if any PC cracks or flakes off
.....b) hammer the PC'd cool boolit into a cube seeing if any PC cracks or flakes off
.....c) just because the PC passes the hammer test doesn't mean its fully cured, just that it is sticking well

11 SIZING
.....a) PC'd usually boolits size easily; if not, a little spray case lube can be used
.....b) IF PC is scraped off when sizing polish the entrance to your sizing die
..........1) with fine sandpaper made into a cone with the grit on the outside
..........2) with a Dremel tool, a felt boolit shaped polisher and some fine polishing compound --- I like Flitz
.....c)*** I like running a felt polisher in the sizing die for a few seconds to smooth the machine marks and make sizing easier
12 LOADING:
.....a) PC is normally loaded to regular cast boolit loads
.....b) GC usually aren't needed with PC's boolits until you reach 1600 - 2100 fps depending on the gun, powder, and boolit
.....c) PC'd boolits can work with a softer alloy and be pushed faster/harder than regular lubed boolits

***I like using different colored boolits to designate different diameters or powder charges


Sometimes it helps to see. I have a utube channel and mostly show Casting & Powder coating. Maybe that will help.
Here is some I did yesterday.
8EF594F8-FCAE-4D4E-93B6-A1FF389B81E4.jpeg


Good luck21BC6776-D5CD-4A25-ADE1-2314827CFD08.jpeg13E7CE41-14CC-4E08-9B5E-FFBC6EB94140.jpegAF13A6DD-22A5-4E1A-A2AB-544904DD556B.jpeg

CW
 
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fiver

Well-Known Member
I think I do maybe half of what CW does.
I water quench some and air cool some.
and I touch them with my hands.
and I don't use any clampy things to pick them up, I pick them out of the powder with nitrile gloves and spin them between thumb and forefinger.
I don't get near as much powder on mine as he does, but the color and coverage is very consistent.

there isn't a whole lot of 'must do' things when it comes to coating, just find what works for you and go with it.
 

popper

Well-Known Member
When I used the oven I just tossed a couple old cotton towels over it - they turned light brown but never even smoked. I cook for an hour (I WD), no problem even with HF. Over temp will slump the bullets but you got to get 600F or so to harm most powders.
 

creosote

Well-Known Member
Thanks all!!!
That's a heck of a write up CW.

with all this info only I can screw it up now. :)
Iv got some hygrometers on their way. And need an oven thermometer.

Mark
 
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CWLONGSHOT

Well-Known Member
Yeah thermometers are pretty important part if you're not getting the right temperature in your oven you're not going to cure the powder the way you're supposed to and it's not gonna work as you expected to. ;) :p
 

Joshua

Taco Aficionado/Salish Sea Pirate/Part-Time Dragon
And remember that oven temp and part temp are two different things.

First I preheat my oven, then I load it, then I give the parts (bullets) ten minutes to heat up, and finally twenty minutes of cure time. Total time in the oven is 30 minutes.

In the article that CW posted above the author calls for 25 minutes. It depends on your oven and how much heat you loose when loading, and the mass the bullets that you are curing. Also remember that powder melts just above 300°F. Powder melting temp does not equal part cure temp.

Thirty minutes works in my set-up.
 

creosote

Well-Known Member
That confirms what I was trying.
It only took a few minutes for the powder to get glossy.
Faster than was expected.
Gave it a few more, then set the timer.

I'm sure the insulation helped because during the cook, the burners never got red like they did while coming up to temp.

The fan sure is noisy though, it rattled every part in the stove. Rattles changed tempo as temperatures change. It was the cheapest crapazon had. I can't see many people putting up with that!
All the better for us.
 

Dimner

Named Man
3: SWIRL NOT SHAKE!
Your attempting to create static electricity. The more contact the bullets make The better chance they have. Beads can help #5 containers can help. Black beads & mixing containers can help. NONE ARE REQUIRED!!
One thing I will add... after swirling I will shake straight up and down for at least 15 seconds often 30 seconds. This really seems to get the powder airborne and promotes a nice even coating of powder.
 

fiver

Well-Known Member
swirl then shake, mostly shaking.
but I use BB's, and a clear cup, so I'm floating everything together and I can see what the powder is doing.
 

creosote

Well-Known Member
You guys keep adding little things I kinda noticed but wasn't sure.
I noticed the powder was swirling on the bottom. I did get it air born which seemed to help.
Thank you!!
Most of my bags of bullets have some lubed inside contaminating them, but 15 pounds of 38's & 45's were freshly cast two days ago.
 

creosote

Well-Known Member
I swirl, never shake, but then I'm using BLL. I heat treat at room temperature on an old window screen for a couple of days. But them there bullets sure are pretty.
You can't confuse me.
Heat treating on window screen can only be done before maple syrup season.
 

Intel6

Active Member
Getting great responses that I can't add anything to. You did ask about Eastwood squirrel grey PC. I started with (and am still using) a grey from Eastwood, not sure if it is Squirrel or not but I like it.

Here are some .458 SOCOM bullets coated in it.


PC 458 SOCOM.web2.jpg


And some .500 S&W bullets coated out in the sunlight.


500 S&W loads web.jpg
 

Dimner

Named Man
So as I see more and more pics of people's work with PC, I have to admit my somewhat fragile ego is in awe of the results you guys are getting. I keep telling myself that the small areas where there is no pigment coverage on my bullets is not an issue, but it still kind of irks me.

So I ask the herd this ... Where are you guys getting your shake and bake powders? So far I have only used powder that I have purchased on another forum. Should I try a different brand and see if I can get the results that you are all getting?
 

Rockydoc

Well-Known Member
Getting great responses that I can't add anything to. You did ask about Eastwood squirrel grey PC. I started with (and am still using) a grey from Eastwood, not sure if it is Squirrel or not but I like it.

Here are some .458 SOCOM bullets coated in it.


View attachment 20121


And some .500 S&W bullets coated out in the sunlight.


View attachment 20122
Those are some very pretty bullets. That surface is so smooth. Are you spraying the PC? I don’t think I have gotten that slick of a result shaking, dumping and baking.