This is a combination cleaner/degreaser and concrete etcher. Though designed for finishing/refinishing concrete pools, it could be used on any horizontal concrete surface where a cleaner and etcher are required. Dilution amount changes depending on whether it's going over bare concrete, or a pre-painted surface. Coverage, bare concrete: 400sq ft/Gallon Coverage, pre-painted surface: 600-800sq ft/Gallon $32+taxes. In store purchase only, unless on account.