SIL‑ACT® ATS‑40 is a clear, penetrating silane treatment which causes concrete, masonry and many natural stones to become repellent to water, chloride, waterborne contaminants and weathering elements, preventing the premature deterioration of parking decks, bridge decks, pavements and other types of concrete and masonry structures. Performance testing makes SIL‑ACT® ATS‑40 an excellent choice for any project requiring the highest quality clear penetrating water repellent.