Fast setting hydraulic cement - stops water, even under pressure. Compressive strength of 11975 PSI after 28 days fully cured. Sets in 3-5 minutes. Patch mortar joints, cracks and holes in masonry walls. Reduces radon gas penetration. No top-coat required. Soap and water clean up. Powder, mix with water. Apply with putty knife, trowel or gloved hand.
