MasterSeal NP 100 is formulated with unique BASF polymers that allow for versatile adhesion to a variety of substrates while accommodating high movement and providing long term durability. MasterSeal NP 100 is a high performance, low modulus, high movement, non-sag, fast curing, and ready-to-use hybrid sealant. It combines the best qualities of organic and silicone sealants to keep moving joints weather-tight.

Product Features

  • Superior adhesion to a variety of substrates resulting in a long term bond

  • Low modulus, formulated for joint movement of ±50%

  • Resists chalking, cracking and fading to maintain long lasting weather-tight seals

  • Wide temperature application range

  • Available in six standard colors

  • Meets all state and federal VOC regulations 

  • Compatible with elastomeric coatings and can be painted soon after installation

  • Easy to gun and tool, which speeds up application and makes neater joint

  • Fast curing helps to speed up job-site production

  • Non-staining formula for use on stone and other sensitive substrates



  • Vertical or horizontal

  • Exterior or interior

  • Above grade

  • For sealing a variety of building joints against water and air intrusion

  • Joints with extreme movement

  • Storefront systems

  • Expansion joints

  • Panel walls

  • Precast units

  • Aluminum, vinyl and wood window frames

  • Fascia

  • Parapets

  • Sanitary applications

  • Roofing