HS 240 is a premium, high performance, single-component silane acrylic, 20% solids, low VOC (400 g/L), sealer designed for concrete or any cement based product. As with most acrylics it is vapor permeable and readily applies outside. However, HS 240 is specially formulated for extreme climates where a low VOC sealer is required. The unique silane formulation creates the nano-sealer technology that deeply penetrates and reacts internally with cement, slowing moisture migration and efflorescence and intensifying bond capacity. Even in warmer climates HS 240s slower evaporating solvents will not âcotton candyâ before the applicator can finish a tight, smooth surface. A single coat application will provide a UV shield, enhance the beauty, and protect the surface of driveways, garage floors, patios, walkways, pool decks, and stucco.