Holy crapoly,that's cheap! Heck you cant even get into a powder coating gun for that! Last I checked around here,it was $80 per rim,blasting and podwer coating included.
Just my opinion, beware of getting what you pay for Mad Dart. Please check out his references and see a few work samples before making a commitment. You've worked too hard on that car to let a few bucks turn stunning into substandard.
