I have a galvanized frame for my Land Rover restoration project. I know that galvanized requires etching before painting and that I cannot use a single stage self etch primer. I went to my local auto paint supplier and got a quart of Sherwin Williams Corrosion Shield Vinyl Etch Primer (No. E2G973) which is a two stage self etching primer. Will this be compatable with the Original or Extreme Chassis Black?