Your definitely on the right track, prep is 9/10's of the paint job. Are you going to paint the spokes as well? They would be a little trickier due to the small diameter. I used to paint a lot of aluminum at work and it will stay on if your prep is good. Going for basic black or something more exotic?I figure scuff the wheels with a red Scotch brite pads or steel wool, clean with acetone, prime w/ self-etching primer, and paint with Krylon Fusion, it will stick to plastic (which will flex) it should stay on the wheel.