Originally Posted by
Dragonheart
I doble coat rifle bullets to increase the thickness of the polymer. If I have a powder that will not tumble coat in a single coat I do a preheat to increase the coating bond & thickness. If I have a powder that will not give me a one coat coverage with a preheat I either throw the power away or use it to spray other items.
To double coat or multiple coats, do a "Partial Cure" on the first coat/s, meaning heat the powder to the point of a good flow, usually about 250 degrees F then stop the process and cool. Then do your 2nd or final coat and cure as normal. I usually do a color first coat on rifle bulets then spray a clear 2nd coat that seals/bonds the gas check. Using this process multiple coats flow and bond together.