Products / 7780/7781 Water-Borne Epoxy Primer

7780/7781 (Hempel 280JB) is a two-component, water-borne epoxy primer, mixed 4 to 1 by volume, applied before high-performance surface-applied coating systems. Its product data sheet lists 28 percent volume solids, VOC of 85 g/L, 0.42 perms moisture vapor transmission at 7 mils (ASTM E96) and 400 psi adhesion to concrete (ASTM D4541), and names Factory Mutual Class A and LEED approvals. It comes as a red 5-gallon kit and is the primer in Neogard's Elasta-Gard BUR/MB Aliphatic, Elasta-Gard Emulsion and Elastacryl BUR/MB roof coating systems over built-up and modified bitumen roofs.