MasterSeal® NP1™ Sealant Limestone 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.

• 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