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Quikrete Hydraulic Water-Stop Cement is a specialized fast-setting formula engineered for sealing active water leaks and moisture intrusion in concrete structures. This 10-pound bag delivers rapid hydraulic action, expanding slightly upon hydration to create a watertight seal that stops water flow immediately. Ideal for basement walls, foundation cracks, and below-grade applications, it bonds effectively to wet surfaces and cures to a durable, permanent barrier. Professional-grade performance for critical waterproofing repairs.