Pettit Aluma Protect Epoxy Barrier Coat Marine Primer For Aluminum Hulls Aluma Protect is a 2 part strontium chromate primer designed to form the ideal barrier coat over roughed bare aluminum. This is the appropriate epoxy to use when aluminum has been sandblasted, sanded or ground so that a tooth is present. For smooth aluminum, choose Pettit Metal Primer. AlumaProtect provides maximum resistance to fresh or salt water, thus eliminating corrosion. This complete coating system resists water, ind