I have a 1968 Alfa Romeo 1750 GTV coupe and I've had it for two years. When I first got it, it was in perfect restored condition. I have always taken the upmost care with it but, at a recent inspection, rust pockets have been found in the front and rear left quarter-panels and on the left side door. Is this because I live in a house next to the beach and the salt water has corroded it or is it something else