Brick Sealing (Siloxane Repellent) is a solvent based siloxane water repellent designed to render water repellency to old and new masonry. It provides a long lasting, breathable barrier which exhibits excellent resistance to water, airborne dust and dirt, acid rain, salt, efflorescence, and freeze/thaw damage and spalling. The water repellency of brick sealing does not allow the substrate to retain moisture and therefore prevents growth of mold and mildew.