Adheres to all RV roof membranes. XTRM Universal is formuated with a blend of the strongest and most flexible synthetic polymers. Has excellent adhesion to many substrates including aluminum, brass, steel, glass, mortar, wood, PVC, EPDM, TPO and TPV. With superior weather resistance and sealing properties, XTRM Universal remains flexible for years. No primer required Superior durability Excellent adhesion