Thanks for the advice. Most of the parts I'm working on are so rusted that I'm taking them down to bare metal and the engine block I took to the machine shop where they vatted and tested it. I asked them not to paint it since they usually use a blue so they left it bare. The good thing I do like about the primer is that since most of these parts are pretty rusted there is a lot of pitting and the primer does a good job of smoothing out the small stuff