The water and oil repelling qualities of Ameripolish SR2 Sub-surface Stain Resistor2 provides superior stain protection on most substrates. With a small molecular structure, maximum penetration is assured. Penetration depth is controlled by the application rate, or loading rate. This makes SR2 ideal for protecting polished concrete and other dense, color-sensitive surfaces. Moisture and water-carried salts are blocked, minimizing chlorides and surface erosion.