Stop active water leaks and make fast, durable concrete repairs with this 4 lb hydraulic cement. Designed to set quickly—even under wet conditions—this high-performance repair material expands as it cures to create a tight, watertight seal. Ideal for patching cracks, sealing masonry joints, and repairing concrete surfaces in basements, foundations, and retaining walls, it’s a must-have solution for both contractors and homeowners handling moisture-related repairs.