there are a few tyre fitment places that can put you in contact with wheel repair companies. Unless you get them all repaired and sprayed, see if you can buy just one of the wheels brand new direct from the maker, to repair a decent alloy these days can cost as much as buying one brand new. Mate had his done, looked a good finish cost him ?60 had a fair bit of curbing, anyway took the alloy to change his tyre and the tyre removing tool picked out all the filler points where normal filler had been used, looked worse than before.