DAP® Quick Plug hydraulic and anchoring cement is a versatile high-performance patching compound, formulated to stop running water through deep cracks, holes and imperfections in concrete and masonry surfaces. When used properly, it creates a watertight seal in just 3 to 5 mins. DAP® Quick Plug works both above and below ground level. It can also be used to anchor machinery and other fixtures into masonry and concrete surfaces. DAP® Quick Plug expands slightly to fill all voids, securely locking itself into place. When completely cured, it is stronger than Portland cement.