BASF Stone Polyurethane Sealant Cartridge - Weather-Resistant - 12 Pack, 10.1 oz, Gray

MasterSeal NP 1 by BASF is a one-component, high-performance, non-priming, gun-grade polyurethane sealant designed for both indoor and outdoor use. This urethane sealer cartridge is ideal for sealing joints in concrete, masonry, panel walls, precast units, aluminum and wood window frames, roofing, fascia, parapets, vinyl siding, and storefront assemblies. MasterSeal NP 1 caulk sealant requires no mixing and typically does not need priming to bond effectively to a variety of materials, making it convenient for professional and DIY applications. Its elastomeric properties allow for flexibility and durability, even in weather-exposed or immersed conditions, making it suitable for above and below grade installations. The 10.1 oz cartridge provides ample coverage for multiple projects, and its weather-resistant formulation ensures long-lasting protection against water and environmental elements. MasterSeal NP 1 is recommended for expansion joints and areas requiring a waterproof seal, delivering reliable performance in demanding environments. Manufactured by Masterseal, this polyurethane sealant is trusted for its strong adhesion and ease of use, making it a preferred choice for construction and repair projects where a durable, waterproof seal is essential.