Leak Repair

Call: 1-800-321-7212

Prime Flex 910 extremely thin liquid resin

Prime Flex 910 is an extremely thin liquid resin that reacts with moisture when injected into soil forming a rock hard, watertight mass. 910 is used to stabilize loose soil or sand, stop underground water flows, and seal leaking seawalls or other below-grade structures. Prime Flex 910 is a single-component, water-activated, hydrophobic, super low viscosity polyurethane injection resin. It requires the use of Prime Kat catalyst.

Recommended Uses

  • Injecting hairline cracks, expansion joints, wide cracks, pipe joints, or pipe penetrations
  • Sealing active leaks in above- or below-grade concrete structures
  • Oil-free oakum or open cell backer rod may be soaked in Prime Flex 900 XLV to create a watertight gasket


Typical Areas of Use

  • Highways, roads and bridges
  • Airport runways and taxiways
  • Earthen dams
  • Excavation pits and tunneling launch pits
  • Seawalls
  • Retaining walls
  • Sink holes



  • Encapsulates and strengthens loose soil
  • Watertight
  • Controllable set time
  • Pumped as a single component


Cured Characteristics

This one-component liquid has a low viscosity, allowing it to penetrate hairline cracks deep into the structure. When the material contacts water, it reacts to form a white, flexible gel-like foam that acts as a barrier, sealing the cracks that allowed water to leak.

As the foam reacts, it expands to fill the space and bond to the concrete to hold it in place, creating a closed cell mass that does not allow water to pass through or around it. The foam’s flexibility allows it to expand and contract along with the structure it has sealed, so it remains water tight despite temperature fluctuations.



  • 5 gallon pail
  • 50 gallon drum
  • 250 gallon tote

Made in the U.S.A