ENDURA COAT is a scientifically proven concrete sealer that actually locks into the concrete surface by cross-linking with the PATENTED SILICRETE SYSTEMS ENDURA POLISH and ENDURA HARD chemicals that were previously used in the polishing process. As a stand alone sealer it works terrific on all polished and/or steel troweled concrete surfaces. The added piece of mind that you need against stains and acidic contaminates. It also adds an incredible gloss factor to any concrete floor. Indoor use only!