Acrylic latex with silicone. Adheres to most any surface or material, including wood, masonry, concrete, brick, drywall, metal and glass. Caulks and seals door and window frames, baseboards, vents, trim, siding and around gutters. Fills cracks and joints.Caulks sinks, tubs and shower stalls. As an interior adhesive for bonding ceramic and other tile. Ultra smooth, fast and easy to use. Finger smoothable. Water clean up. Has outstanding paintability and double the mildew protection. Rust inhibited and non-yellowing. Vacuumized. Exceeds ASTM Specifications C-834.