A high strength cement waterproofer for internal and external rendering, roof screeds, swimming pools, tanks, retaining walls, basement walls and reservoirs. Improves workability and plasticity of concrete and mortar in the wet state and resists water penetration even when under pressure. Improves the plasticity of the mix making it easier to use. Retards suction in multi-layer renders. Reacts with free lime in the mortar to form hydrophobic crystals which block the pores, thereby improving the water resistance of the mix. CE Approved.