Look at it real close and make sure you don`t see what looks like very fine spider webs my goodmark panels had these webs on it when I sanded it of it was rust starting. AMD is a far better product than goodmark but give it a good look to be safe
excellent advice. My brother has a '69 Camaro that he is working on for a friend and the brand new Goodmark fenders had significant surface rust starting under the factory sealer/primer.
