MasterSeal NP 1 is a one-component, high-performance, non-priming, gun-grade, elastomeric polyurethane sealant. It requires no mixing and typically requires no priming to bond to many materials, including concrete and masonry. Used as an acoustical sealant, MasterSeal NP 1 reduces sound transmission in partition systems to support high STC values by sealing spaces around cut-outs and at perimeters of partitions. The sealant cures to a tough rubber to form a long-lasting acoustical seal. 

• Multiple external and internal applications including sealing door and window frames, roofing substrates, and cladding joints
• Bonds to metals, masonry, wood, vinyl, cement fiber board, granite and marble
• Low solvent content – under CARB limits
• Applications: • Interior and exterior, • Above and below grade, • Immersed in water, • Expansion joints, • Panel walls, • Precast units, • Aluminum and wood window frames, • Roofing, • Fascia, • Parapets, • Vinyl siding, • Store front assemblies