Weber's highly polymer-modified adhesives and grouts have enough flexibility when set to accommodate thermally induced movement. weber.floor flex with Low Dust Technology™ can be used to cover and protect the wires that otherwise could get damaged during application of the adhesive. Once weber.floor flex has dried use weber.set rapid SPF with Low Dust Technology™ to tile your floor. weber.set rapid SPF is specifically formulated to allow the fixing of large format ceramic, porcelain and natural stone tiles. Finally, use weber.joint pro with Mould Stop Technology to grout your floor. weber.joint pro can be applied in joints from 1mm to 10mm. Tile Grouts, Tile Adhesives, Tiling Products.