Re: How do you paint aluminum rims???
Adhesion is the only issue with painting aluminum. Even to powder coat an aluminum part, the surface has to properly prepped for adhesion such as bead blasted or atleast "scuffed" to create a mechanical adhesion.
Painting requires the use of an etching primer first. Then can be easily painted with either a single stage or base/clear.
Powder coating is much more durable.
As far as plastic dip, I am not a fan. I cannot see the advantage of layering on a coating that could add any significant weight on the wheel.