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Vehicle Information: Model: 911; Year: 1977; Body Type: Coupe; Total Mileage: 114000;

I am about to remove the existing quarters and replace with pieces from a '76 930, which have surface rust on areas where the undercoating is missing. The questions are: 1. are these supposedly galvanized? 2. What is the best way to go about preventing the rust from spreading? I plan to use a scotch pad on a die grinder to remove it but then what? Should I remove all the old undercoating and replace it or only where it's loose? Then recoat before or after welding them on?

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