For all intents and purposes, rims cannot be repaired.
I've had bad experiences with:
Carcone (more than once, i'm an idiot)
no experience with rim techniques
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2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff