i powdercoated the wheels on my bmw 540 wagon a year or 2 ago, gloss black, haven't had any trouble with it. i got mine done here in SW LA at an industrial maintenance place and only paid like 35 or 40/wheel to do it. came out fine. anyhow, what i'm getting at is that you may be able to find someplace that does powdercoating as a service for the larger whole, than a specialty niche like auto rims, or engine parts (like a performance shop, etc.). i don't know how much it's supposed to cost, i've heard of people paying several hundred dollars to have theirs p.c.'d. then again, i did have to have the tires broken down off the rim, remounted and rebalanced, so i'm probably another 30-40/wheel. but all things considered, i was probably only in the job for around 200ish. imo, p.c.'ing is the way to go. haven't chipped or peeled at all. although i am careful not to curb my rims and obviously don't go off-road in my soccer-mom-mobile.