Paint /bodywork question

[s,one]

Is it possible to make local repairs and paint to remove stone chips etc(and I don't mean the garage on the corner).I would imagine that when stone chips occur they remove the galv coating on the steel as well. So if your bonnett and sills are chipped are you going to end up with a patchy coloured car if you dont respray the whole thing.My car by the way is a 85 930 in white.

Cheers

Steve