I have used my HF rotary for tumbling powder coating. I have a drum dedicated to powder coating and most colors don't mix enough to make much difference. I have tried some air soft BBs in with the bullets and powder and it may help a bit. I tried using a container inside a drum, but seemed like more work for no advantage. All in all, using a rotary may be beneficial but I saw no major improvements over a cool whip tub in ease of coating or final product ...