But if you are in a pinch and need to paint wheels, I use auto spray paint. Clean, prime, paint. Rustoleum - semi gloss - black or whatever color you want. Comes out nice. The Rustoleum has a fanned spray nozzle which makes it nice to evenly coat. You have to check the noxxle for it. It will look different than an ordanary nozzle and you can rotate it to fan up/down or left/right.
THat is one heck of a clean up job on those wheels!