Custom Building Products VersaBond 50 Lb. Gray Fortified Thin-Set MortarPolymer modified, Portland cement mortar system formulated to provide excellent adhesion to interior surfaces without the addition of a latex additive. Use to adhere glazed and unglazed ceramic mosaic, glazed wall tile, quarry, terrazzo, cement bodied tile, high lug tiles and pavers to properly prepared interior surfaces such as exterior grade plywood and many resilient flooring surfaces. It also offers increased bond strength when adhering to