dry tumble powder coating?
My first attempts with the thinner-powder coat-wet tumble did not work very well. I purchased four colors from Powder by the pound, red, grey, white, and green. The red mixed with the thinner and bullets made a solution that looked ok but was kind of blotchy. I could tell this process if very sensitive to when you need to stop tumbling the bullets and move them to the tray to "wet out" and dry. It took me several tries before it worked at all.
I then tried the dark grey and white powders, both turned to a thick goo that separated from the solvent and coated the bullets with a very thick layer of powder "paste" no matter what the powder-solvent ratio was.
These two colors (grey and white) seemed to be very attracted to the bullets so I decided to see what happened if I tumbled the bullets in dry powder, same process as the wet method just without the solvents.
It worked great!
I put a table spoon of powder in a Tupperware container, added about 50 bullets (30 cal x 200g) tumbled them around a little until they had a even coat of dry powder then plucked them out with needle nose pliers and set them base down on not stick foil for baking in my new $20 toaster oven. Any excess powder remains in the tub, and can be re-used. No critical mix ratio or wasted powder!
The only trick is the powder will rub off if you try to handle the bullets with you fingers while moving them from the tub to the tray.
I also tried dumping the dry tumbled bullets directly onto a wire tray (gutter screen from hardware store) and that worked but the bullets show spots where they contacted the screen and some stuck together, I think this would happen with any method where the bullets were dumped randomly.
This seems like a method that could take the prize least equipment (no PC gun required), lowest stink factor (no solvent) and ease of use.
Give it a try and let me know if you have similar results.