MasterSeal NP 2 is a multi-component, highly flexible, non-priming, high performance polyurethane sealant. It has been successfully tested for joint movement of ±50%. It can be tinted to multiple colors.


  • Interior and exterior

  • Above and below grade 

  • Immersed in water

  • Expansion joints

  • Panel walls

  • Precast units

  • Aluminum and wood window frames

  • Roofing

  • Fascia

  • Parapets

  • Vinyl siding

  • Store front assemblies

  • Parking structures

Products Highlights

  • Movement capability of ±50% adds protection against unanticipated movement

  • Weather resistant for long-lasting weathertight seals

  • Easy to gun and tool to speed up application and make neater joints

  • MasterSeal 905 accelerator available for use in cold climate applications to help speed initial cure

  • No primer required for most construction materials, lowering installation costs 

  • Wide temperature application range makes MasterSeal NP 2 suitable for all climates

  • UL listed; Passes 4–hour, 4–inch, fire and hose stream test when used with Ultra Block or mineral wool

  • Suitable for water immersion with documented performance in wet areas

  • Chemical cure allows for faster turnaround time

  • Bulk packaging results in less waste

  • Long pot life provides extended working time

  • Formulated to withstand pedestrian and vehicular traffic