Hydraulic cement waterproof - concrete/masonry"drylok". 4 lbs. Fast-setting hydraulic cement. Stops the flow of water through cracks and holes in masonry surfaces. Mixes easily with water and sets in 3-5 minutes. Seals floor and wall joints and settlement cracks in masonry walls. Anchors metal to masonry. Each 10 lbs. Will fill up to 160 cubic inches.