BASF MasterSeal NP 1 polyurethane sealant, formerly Sonolastic NP 1, is a one-component, high performance, nonpriming, gun-grade, elastomeric polyurethane sealant. It requires no mixing and typically requires no priming to bond to many materials, including concrete and masonry. This reputable polyurethane sealant is ready to use and requires no mixing which reduces labor cost. Joint movement capability is ±35% which allows for excellent flexibility for keeping moving joints tight. Gunning and tooling is easy which speeds application while making neater joints.