Armour Proof AP-1200 - EPDM Rinseable Primer is a low viscosity and water-based rinseable cleaner. This Rinseable Primer is designed to chemically alter the surface of new and weathered EPDM membranes by breaking down the chemical bond of the inorganics on the surface and increasing the adhesion of the Armour Proof AP-3100, AP-3200 and AP-3300 roof coatings to the substrate.