Southern Polyuerthanes (SPI) Epoxy Primer is a type of primer that provides unsurpassed corrosion protection, excellent chemical resistance, and excellent adhesion to untreated aluminum. It is available in gray, white, black, and red oxide, and can be activated with part # 6700-1 or 6700-4 at a 1:1 mix ratio. It is easily sandable and contains U.V. inhibitors. The primer dries to a semi-gloss finish, which makes it easy to see where dings are. It has a 12-16 hour dry sand time depending on temperature, and a 30 minute flash time at 70 degrees. This primer and activator is available in both quarts and gallons and activator is included with the purchase of the epoxy primer.