FWIW
I can't get HF paint up here
I CAN get Peavey Mart, our near equivalent CHICOM importer.
I have used some of that paint to make ugly splotchy bullets in a shake and bake manner, and they were covered.
I don't have a tumbler, but if I did, I would try it as well.
I am in the process of trying to get PBTP to ship to me.... crazy shipping rates, but I'm trying to order enough to spread the pain out.
We shall see!