There are several different types of water repellents available, each suited for different substrates. These high-quality water repellents create a hydrophobic barrier that prevents the intrusion of water and water-borne salts into the structure. This greatly reduces damaging moisture penetrations into masonry and concrete, helping to avoid salt leaching, freeze-thaw cracking and corrosion of reinforcing bars. A common misconception is that water repellents are also waterproof. In fact, water repellents are only resistant, not impervious to moisture. It is important to choose the proper system when protecting your building from moisture.