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Mapei Planiseal 88 (formerly Idrosilex Pronto) is a ready-to-use osmotic cementitious mortar that permanently waterproofs concrete and masonry. Its crystalline osmotic action penetrates deep into the pores of the concrete, reacting with moisture to grow insoluble crystals that lock out water — even under hydrostatic pressure, and from both the positive and negative side. Certified safe for drinking water, it's the go-to choice for foundations, water tanks, basements, swimming pools and retaining..