Crommelin Enhance WB 15LCrommelin Enhance WB is a clear, hard wearing, film forming, stain and water repellent coating that enhances and protects the appearance of low and medium porosity concrete and masonry surfaces. Enhance WBs hard film is resistant to water damage and disfigurement by airborne pollutants, and its water repellent properties are supplemented by a highly effective biocide to inhibit the growth of fungi, algae and lichens.