I totally agree with Matt..............using a spray can is an easy way to go also the cheapest. But you will have scratches down the road and if the wheels are not prepared properly, then it surely will chip or flake off . To spray it correctly, you should go with what Matt said about paint, activator etc.
I just paid $140 for a gallon of primer with activator.....................take them to be powdered..........it will last and be less expensive in the long run.