Bostik AP 250 Flexibond is an acrylic dispersion for use as a flexible admixture with cement based tile adhesives and/or grouts. It can further be used as a primer/sealer for ready mixed tile adhesives and floor underlayment screeds. The addition of Bostik AP 250 Flexibond to a non-polymer modified adhesive or grout is required where surfaces are prone to very minor movement and vibration, or where direct fixing to glazed tiles or other impermeable surfaces is required. Improves flexibility and tensile strength giving greater resistance to minor movements and vibration. Reduces permeability. Enhanced adhesion when fixing to non-porous substrates and tiles