PROFLEX™ PR-Series of primers are necessary companion products to be used withthe Proflex™ series of elastomeric membranes. SUTIABLE SURFACES:Concrete (Poured,Prestressed, Precast)Concrete BackerboardsCured (Mortar Beds, Self Leveling Compounds, Gypcrete)Wood (Exterior Grade Plywood, Hardwood, Toungue and Groove, OSB)COVERAGES, PACKAGING:Coverage between 300-800 sq.ft per gallonWeight 10 lb.