Osmotic cementitious mortar suitable for contact with drinking water, for waterproofing masonry and concrete structures. Use Idrosilex Pronto to waterproof foundations, walls, cellars, basements, lift-rooms, swimming pools, canals and reservoirs containing also drinking water. Formulated from cement binders and special waterproofing additives, Idrosilex Pronto is prepared by mixing a 25 kg bag with 5.5-6 litres of clean water according to the type of application. Idrosilex Pronto can be applied by brush, trowel or spray. For application by brush or spray, apply 2-3 coats onto the perfectly cleaned and sound substrate which must be thoroughly soaked with water beforehand. When applying by trowel reduce the mixing water to 5-6 litres per bag. Idrosilex Pronto meets the requirements of EN 1504-2, coating (C), in compliance with MC and IR principles, for concrete protection.