SB-818 Xerosol™ Ag is a one to one by volume, polyurea hybrid elastomeric roof coating. SB-818 Xerosol™ Ag is intended for use as a spray applied protective roof coating for use over concrete, metal, polyurethane foam and smooth built-up roofs. SB-818 Xerosol Ag hould not be used directly over rough built-up roofs unless polyurethane foam is used to create a smooth surface. SB-818 Xerosol Ag can also be used over various single-ply membranes. Contact SprayBuilt for more information.