I am preparing to repaint the dash frame for my Dart. I have not media blasted it as it didn't have any significant rust to speak of anywhere. I have thoroughly scuffed the original paint with sandpaper and wiped it down with acetone. I was getting ready to spray it with Rustoleum textured black paint (not concerned about having factory correct look) and I got to thinking as to whether or not I should put a coat of primer on it first. Do you think the original scuffed paint is suitable as a primer for the top coat to adhere to or should I spray a coat of primer on it?