Strontium Chromate Aluminum Epoxy Primer Easy to Mix and Apply Epoxy Primer for Aluminum Strontium Chromate for Maximum Corrosion Control Smooth finish provides an excellent bonding surface for additional primers or topcoats. - Aluma Protect 4400/4401 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 6455/044. - AlumaProtect provides maximum resistance to fresh or salt water, thus eliminating corrosion. This complete coating system resists water, industrial chemical fumes, and very humid environments.