MasterSeal NP1, Polyurethane Sealant, White, 10.1 Oz. A versatile moisture-curing high-performance polyurethane sealant with permanent elasticity. For use on active, vertical and horizontal interior, exterior joints including expansion wall joints, floor and pavement joints, curtain walls, panel walls, precast walls, window frames, structural components, dams, spillways, and storm water drains. Substrates include concrete, masonry, aluminum, and wood. Bonds to concrete, masonry, and other materials without a primer. Does not require mixing. Dries smooth and is paintable. Sold as 2 Pack.