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, NP1 reduces sound transmission in partition systems to support high STC values by sealing spaces around cutouts and at perimeters of partitions. The sealant cures to a tough rubber to form a long-lasting acoustical seal.