Products Used

Tools Needed

Project Prep

  • Wear PPE: Ensure personal protective equipment is worn due to the heat generated by the mix.
  • Understand the Material: Recognize that Sakrete Leak Stopper Hydraulic Cement is a special blend that sets rapidly.
  • Clean the Surface: Area to be plugged must be free of unsound concrete, grease, oil, paint and any other foreign materials that will inhibit performance. A wire brush is useful in scraping away all loose material.
  • Set the Stage: Dampen area to be plugged before applying product. All holes or cracks should be opened to a minimum depth and width of 3/4 in (19 mm) to allow enough material for proper expansion and bond. Square cut or undercut to avoid leaving a “V” shaped opening.

For best results all materials should be stored at 40°F (4°C) to 80°F (27°C) 24 hours prior to installation.

Safety Notes: Read and understand the SDS before using this product. Wear protective clothing and equipment. Wear gloves at all times. Failure to do so can result in severe burns. Keep out of reach of children.

Project Tip: Only mix what can be applied immediately.


  • Mix Ratio: Start with a 3 to 1 ratio of water to powder.
  • Achieve Consistency: Aim for a “glistening snowball” consistency, adding more powder if necessary.


  • Create the Leak: Simulate a leak to demonstrate the stopping process.
  • Apply the Plug: Form a snowball with the material and hold it over the hole to stop the water. Keep pouring water to ensure that the Leak Stopper is actively holding back the hydrostatic pressure.


  • Let It Set: Allow the Leak Stopper to set for a few minutes.
  • Shave the Face: Once firm, use a margin trowel to chip off the exterior plug for a clean finish.
  • Curing Time: Understand that the material sets in 1 to 3 minutes, faster in sunlight.
  • Final Strength: Recognize that the material reaches 3000 psi and can be used above-grade, below-grade, and underwater.

Project Tip: Hold the patch in place while "shaving" to ensure a clean cut.

Alternate Products

Leak Stopper Hydraulic Cement

Stop Water In Its Tracks