DAP Silicone Grey II Concrete & Masonry Sealant is a one-component, neutral cure silicone ideal for concrete and masonry sealing projects. It forms a durable, flexible, and watertight seal that won’t crack or shrink. Designed for long-lasting performance, this low-odor sealant offers excellent adhesion and resists mold and mildew once cured—perfect for interior and exterior use on concrete joints, sidewalks, driveways, and more.