By penetrating the surface and creating a chemical bond, Protectosil® CHEM-TRETE® BSM 400 penetraates the surface and creates a chemical bond and permanently attaches to the substrate. It is ideal for use on exterior above-grade brick masonry, concrete and most natural stones. By reducing the amount of water entering the substrate, Protectosil® CHEM-TRETE® BSM 400 reduces the intrusion of waterborne contaminants such as acid rain, salt and dirt, and reduces the deteriorating effects of these contaminants, including spalling, scaling, efflorescence, leaching and staining.
Recently over 60 water absorbency tests were performed on the building we coated and the results from each test was a 100% waterproofing or 0% absorbency.
I have 30 5-gallon unopened pales of BSM 400 left over from a recent job. 9 pales are in Baltimore and the rest are in Newport News, VA.