BASF MasterSeal NP1 Polyurethane Sealant · 10.1oz · Medium Bronze 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 acoustic 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. FEATURES One-component formula requires no mixing, helping to reduce labor costs Joint movement capability ±35% provides excellent flexibility for keeping moving joints weathertight Easy to gun and tool, speeding up application and making neater joints No primer required for most construction materials lowering installation costs Weather resistant for long-lasting weather tight seals Compatible with non-rigid coatings and can be painted Superior holding power for long-lasting roof tile installation