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The Geocel 3300® Professional Grade Polyurethane Sealant is a single-component, high-performance polyurethane sealant designed for demanding construction applications. It withstands adverse weather conditions and cures to a flexible, weather-resistant seal with minimal shrinkage. Offering excellent adhesion to a wide range of substrates, including stone, masonry, ceramics, wood, steel, aluminum, asphalt, BUR, concrete, fiberglass, and vinyl, this sealant is ideal for both vertical and horizontal joints. The non-sag, non-corrosive formula is paintable and contains no TDI (toluene diisocyanate). Geocel 3300® is perfect for crawl space encapsulation, roofing, and other challenging environments, providing durable performance without maintenance. Do not apply over damp or contaminated surfaces, or on absorptive surfaces like marble, limestone, or granite without prior testing for discoloration or staining.