What paint system are you going to use? It is generally best practice to stick to a single paint line. Sikkens is what I spray every day of the week. They have a epoxy primer that can be used as a wet on wet sealer or sandable primer surfacer. EPll
Also there are primer surfacers that are DTM... look at rust defender, or the old school NCP 270 from Ppg.... all paint lines have the products you want.
