Since youse guys finally got me into this last month, I've got a no-brainer/quick&dirty system put together with an PID controller (thx Hatch), a Hamilton Beach Toaster Oven, 10-Zillion Airsoft balls, a stack of various-sized Tupperware containers to do the the pre-coat, a 2nd/cheap vibrator tumbler, and Eastwood Mirror-RED*/GREEN*/BLUE*/YELLOW*/SilverVein/CopperVein/OrangeYellow PC.
Trying to mix some of the Colors/Metals didn't impress me worth a darn. And I also discovered that (A) Color Wheel combos of Red/Green gets you Georgia mud -- not yellow; (B) the Color/metal-vein combos didn't really do well; and (C) the metal "veins" by themselves don't stick much at all in the shake method.
Being persistent, I stuck a really anemically-covered copper vein bullet into the oven anyway, baked/cured for 30 min, and then threw it back in the TupperWare shaker. 30 seconds later and it looked like a tick-invested hound -- completely/TOTALLY covered in the powder. (weird)
And a really nifty effect....
(Bragging-at-the-range purposes only.... the Mirrors are otherwise 1-shot and you're done.)
* The "Mirrors" give you Mahvelous 1-coat coverage