Setting new, modern tile over existing tile is now a whole lot easier with MAPEI ECO Prim Grip primer. ECO Prim Grip ready-to-use, bond-promoting primer prepares existing tile or stone surface for new tile installation without the time, labor or dust of a full renovation. Synthetic resin-based, MAPEI ECO Prim Grip enhances the performance of mortars and its adhesion to existing ceramics and other difficult-to-bond substrates.RTU grey latex primer is easy to apply with roller or brush Provides a rough keying surface ideal for polymer modified mortars, render coats and leveling compoundsFeatures effective bond-promoting silica aggregates suspended in a dispersion that offer resistance to moisture and aging