Southern Polyurethanes’ Epoxy Primer not only has outstanding corrosion resistance but provides excellent adhesion to aluminum, metals, fiberglass and plastics. SPI Epoxy Primer sprays easy, lays slick and is easily sandable whether wet sanding, dry sanding or DA sanding. It can also be mixed as a restoration quality paint sealer. Available in black, white, gray and red oxide. A two-gallon kit is $182 with free shipping.