i'm flabbergasted.

remember, the main cost in powdercoating is the baking process. most outfits have room-sized ovens, that are costly to bring to temp. by baking aluminum at 400 degrees, you are contributing to the heat treating process, strenghthening the metal. if you weld aluminum (like building a frame), the finished piece needs to be heat treated as such to regain it's strength and T6 rating. you should ask how thick the buildup is, and measure (or just bring a spoke in with the hub) the tolerance. even anodizing builds up a measurable amount, and must be figured into machining tolerances.