I have taken 5 sets of wheels to City Powder Coaters (Audi A4, Mondeo, Caterham and Esprit) and, though no repairs were required, the quality of the finished product was excellent.
Unbelievable given the price of £20 a wheel (depending on size) and better than a refurbisher local to me who charges 4 times that.
I filled the estate with as many sets as would fit to make the trip worthwhile.
I can not comment if a big repair or heavy corrosion are an issue but light corrosion/tatty wheels came up a treat
Gary