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MasterSeal® NP1™ - Gray

Master Builders , NP1GRAY
QC Supply Part #: 240289
Shipping: Standard
Availability: Backordered Until 10-27-2016

This gray high performance sealant works on most common substrates.


This gray MasterSeal® NP1™ Sealant requires no mixing and typically requires no priming to bond to many materials, including concrete and masonry. This one-component, high-performance, non-priming, gun-grade, elastomeric polyurethane sealant is perfect for everything from wall joints and window perimeters to roof seals and fire-rated joints.

Features & Benefits:

  • Available in 4 colors to match most common substrates
    • Black - #240287
    • Limestone - #240288
    • Gray - #240289
    • White - #240291
  • Flexible to keep moving joints weathertight
  • Primerless to many substrates for quick installation and cost reduction
  • Meets current VOC requirements eliminating compliance issues
  • USDA compliant allowing for use in meat & poultry plants
  • UL listed and is suitable for fire rated joints
  • 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
  • Compatible with non-rigid coatings and can be painted
  • Superior holding power for long-lasting roof tile installation


  • Interior & exterior
  • Above & below grade
  • Immersed in water
  • Expansion joints
  • Panel walls
  • Precast units
  • Window frames
  • Roofing
  • Fascia
  • Parapets
  • Vinyl siding
  • Store front assemblies


  • Concrete
  • Masonry
  • Aluminum
  • Wood
  • Clay & concrete wood tiles
  • Stucco
  • Natural stone
Manufacturer Part Number NP1GRAY



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