I still have a jar of silver mirco sequins from back in the 70's. I still use it once in a while. just a thimble full does an entire car. I had a jar of gold too but it got misplaced somewhere along the way.

I usta' have a spray gun for metallics. It had an air driven motor on the bottom of the cup and a magnetized agitator that you dropped in the cup. The motor would spin the magnetized agitator and it had an air regulator to control the speed of the agitator. Worked great for heavy metallics / metalflakes / pearls / etc.