Karnak 3 Gal. 502MS Karna-Flex Repair Sealant White

502MS Karna-Flex is an elastomeric, thermoplastic-rubber mastic. Its ease of application, superior adhesion, elasticity and durability make Karna-Flex an ideal repair sealant. Available in a brush mastic or caulking cartridge. USES: 502MS Karna-Flex's elastomeric properties make it an excellent sealant for prepared metal, concrete, asphalt, spray polyurethane foam and plywood roof system details. Ideal for sealing and waterproofing cracks and splits on BUR and modified bitumen asphalt roofs, metal roof seams and splits, EPDM, TPO and PVC seams as well as gutters, fasteners, pinholes in metal, flashing and curb details. Also use to seal around skylights, penetrations and roof top equipment. May be applied to wet or dry surfaces. PVC and TPO roof surfaces should be at least 4-years old prior to application.