Master Seal 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 mason...

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Product Review

Master Seal 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.

  • One-component formula requires no mixing, helping to reduce labor costs
  • Joint movement capability ±35% provides excellent flexibility for keeping moving joints weather tight
  • Easy to gun and tool, speeding up application and making neater joints
  • No primer required for most construction materials lowering installation costs

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