Quick view WHITE Masterseal NP1 One-Component, Elastomeric, Gun-Grade Polyurethane Sealant 11oz Tube How does MasterSeal NP 1 work? 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,... MSRP: Was: Now: $11.30 - $305.10 Choose Options