I'm going to put my car into the shop to have a recently self-inflicted passenger door scrape n' dent (dumbass move) and the driver side wheel well repaired where the tire caught the lip. Any idea from the experts as to what type has the best properties to match and blend with 35 year old metallic silver? One shop told me they use Envirobase PPG for mixing metallics because it apparently does well in that regard but I don't know.