Special purpose improving additive for tile adhesives and grouts. Increases bonding power and adhesive strength, as well as flexibility, durability and resistance to moisture. It is recommended, as primer, for absorbent substrates and aircrete. Use it also for stabilizing brittle floor cementitious mortars and filling mortars. A necessary additive when working on substrates with intense expansions and contractions because it imparts flexibility to adhesives and grouts.