i did my own wheels too, as well as my car. take a piece of 320 and a red scotch pad, both 3M brand, and scuff them down. make sure there are no shiny painted areas left, but also take care not to scuff it down to bare aluminum either. next spray a good primer such as PPG brand and sealer to give the new paint something to stick to. then spray your base, about five coats, then your clear(if you are using a double stage paint). most wheels are painted with a single stage paint from the factory, but this will give you a better shine.