Davco Ultraprime is an acrylic surface primer designed to increasethe bond strength of tile adhesives and waterproofing membranes. Davco Ultraprime can be applied to concrete and most common building substrates prior to the application of Davco adhesives and waterproofing systems. Ultraprime can be used prior to the application of adhesives or underlay. Care needs to be taken as to the nature of the floor and to ensure it is prepared correctly.