SB-3330 Protect-A-Wall Concrete Sealer from Surebond is a water-based, single-component, epoxy-modified penetrating sealer that resists acid, salt, weathering and discoloration from UV light. The non-hazardous sealer can be used indoors and outdoors on both new and old surfaces in addition to decorative installations. Breathability will no trap efflorescence but provides a moisture barrier that resists mildew, fungus and algae.