Masterseal 10oz NP-1 Sealant One Part Urethane

This one-part polyurethane sealant is a reliable solution for sealing and bonding a wide range of common construction materials, making it an excellent choice for both first-time users and experienced professionals. Designed to be easy to apply straight from the cartridge, it requires no mixing and bonds to many surfaces without the need for a primer, helping save time and reduce preparation steps. Once applied, it cures by reacting with ambient moisture to form a durable, flexible seal that accommodates movement and helps protect against air, water, and environmental exposure.

Ideal for interior and exterior use, this sealant performs well in general construction, repair, and maintenance projects. It is commonly used around door and window frames, roofing substrates, siding and panel joints, and other building connections where long-lasting flexibility is essential. Its ability to bond to materials such as concrete, masonry, wood, metal, vinyl, cement fiber board, and stone expands its usefulness across residential, commercial, and industrial applications.

The cured seal remains flexible, resists shrinking, and maintains strong adhesion over time, even in areas subject to expansion and contraction. With a low solvent formulation that meets environmental requirements and compatibility with many coating types, it offers both performance and finish flexibility. Fast skin formation and efficient curing allow projects to move forward quickly while delivering dependable, professional-grade results.

Feature Benefits

• One-part polyurethane sealant that requires no mixing and is ready to use
• Bonds to a wide variety of common construction materials without primer
• Suitable for interior and exterior sealing and general construction applications
• Remains flexible to handle joint movement and environmental stress
• Non-shrinking formula supports long-term durability and performance
• Low solvent content meets environmental compliance requirements
• Compatible with multiple coating types for finishing flexibility
• Fast curing helps projects stay on schedule