DIY Concrete Crack Repair Kit – Epoxy Injection Instruction

Repairing Crack In Poured Concrete Walls

Surface Preparation

• Place a tarp, plastic sheeting, or drop cloth, on the floor in the immediate work area.
• Remove any loose concrete, dirt, paint, or efflorescence, roughly 1-2 inches on either side of the crack.
• SURFACES MUST BE DRY for the surface sealer to cure. If the area to be repaired is wet use a hair dryer/heating gun or oil-free compressed air to dry.

Surface Port Placement

• Injection ports should be affixed to the wall roughly 8 inches apart and centered over the crack.
• Place a mark on the wall roughly 4 inches above the lowest end of the crack (4 inches above the floor if the crack extends below the floor/slab). Follow the crack and place a mark every 8 inches.
• Using separate mixing sticks, remove equal parts of surface seal Part A & Part B from jars onto a piece of cardboard, scrap wood, or paper plate. Only remove enough material that can be spread in 2–3 minutes. Mix for 30 seconds with the trowel, until the epoxy is uniform in color.
• Spread the surface sealer onto the base of the port using the trowel. DO NOT BLOCK THE OPENING OF THE PORT. Place the port onto the wall, centered over the crack, and cover the base with additional surface sealer to hold it in place. Attach additional ports until a port has been placed at each of the marks.
• Allow the surface ports to “set” for roughly 10 minutes, and then mix additional epoxy to completely cover the crack opening. Be sure to cover the entire crack. Properly applied surface sealer should be 1/8” thick and extend roughly 1 inch to either side of the crack.
• Do not push the surface sealer into the crack – just cover the surface.
• Allow the surface sealer epoxy to cure for 30-60 minutes. Once the epoxy is “fingernail hard”, the injection process can begin.

Injection Procedure

STEP 1: Remove the plastic cap from the cartridge and then twist and pull to remove the plastic seal.

STEP 2: Seat the backflow restrictor on the end of the cartridge and then place the mixing nozzle over the restrictor.

STEP 3: Secure the mixer in place with the retaining nut.

STEP 4: Attach the wide end of the flexible hose assembly to the end of the mixing nozzle by pressing firmly.

STEP 5: Attach the narrow end of the flexible hose assembly to the lowest port by pressing firmly. For horizontal cracks, begin at either end of the crack.

STEP 6: Begin injecting epoxy into the crack slowly using low pressure. Expect to spend 2-4 minutes at each port.

STEP 7: When the epoxy is seen flowing from the port above, use the white pinch valve on the hose assembly to stop the flow of epoxy. Cap the port.

STEP 8: Move to the next port and repeat the injection procedure until all ports have been injected. The ports can be removed by striking them with a hammer 3-4 hours afterwards. The surface seal epoxy is paintable if desired.