right, but you still need to clean your wheels prior to painting them. It's a lot faster to have them run through an industrial size blaster (make sure the abrasive is a soft one, check with the guy running the blaster. last thing you need are chips and nicks that leak air out!) than to clean it out manually. Then sand it, primer it, and paint them
However, at that point, it's a better idea to powdercoat them black. Chances are teh same place may do both. Problem is you'll still wind up spending 300 bucks total if you powder coat them.
Blasting them and rattlecanning seems a logical choice if you want sub 100 dollar clean black wheels