Matching paint??? HELP

Minolta lenses fit Sony DSLR's. IIRC they bought the Minolta 'mount'. Lots of good classic glass out there for Sony Alphas, used to go for peanuts before the Alphas came out then the prices skyrocketed for old Minolta primes. Whats best way to fill in a scratch, ie. a nasty scratch that takes flecks of paint and primer down to undamaged metal..that thin body glaze stuff?