Drylok Fast Plug Hydraulic Cement 4 lb.

Drylok Fast Plug Hydraulic Cement is the ultimate solution for rapid, reliable repair of cracks, holes and active water leaks in masonry surfaces. Formulated for both interior and exterior use, this high-strength putty stops water under pressure in just minutes—no need to gut out walls or wait hours for a cure. It expands as it sets, locking in place to form a permanent, waterproof barrier that can be painted or coated to match your existing finish.

Whether you’re patching basement walls, sealing floor joints or anchoring railings and posts, Drylok Fast Plug delivers professional-grade performance with simple water-mix application.

Key Features

• Fast-Setting: sets in 3–5 minutes to halt leaks immediately
• Waterproof: stops the flow of water through cracks and holes
• Versatile: ideal for sealing mortar joints, settlement cracks and anchoring metal to masonry
• Easy Mixing: just combine 3 parts cement with 1 part water to achieve a trowel-ready putty
• Expanding Formula: grows as it cures to fill voids and prevent shrinkage
• Paintable: once set, accepts masonry coatings, cement paint or oil-/latex-based waterproofers

⚠️ WARNING: This product can expose you to Silica, crystalline known to the State of California to cause cancer. For more information, visit www.P65Warnings.ca.gov.