Gripflex by Dribond Construction Chemicals is a premium polymer-modified, water-resistant, cement-based adhesive for bonding ceramic, porcelain and stone tiles to porous and non-porous surfaces subject to vibration and thermal movement.
It can be applied as a thick or thin bed, internally and externally, to floors and walls. Gripflex adhesive is for fixing over most substrates, including concrete, heated concrete slabs, cement render, fibre cement sheets, plasterboard, existing properly prepared ceramic tiles, and waterproof membranes in shower alcoves. selector.com/ceramic-tile-adhesive-gripflex-1