Depends how badly kerbed they are, remove the aerosol overspray with neat petrol or paint thinners, white spirit on a rag and see what your left with, maybe put a pic up? I used some simoniz alloy wheel silver paint on an alloy on my old ST before i sold it but did a proper job of flatting it back with 1200 wet and dry first and i was suprised how well it matched up to the other 3 !