How to Repair, Seal, and Waterproof Concrete Cracks | Video

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    Project Instructions

    Always wear eye protection and waterproof gloves when working with polyurethane sealant and work in a well-ventilated area.

    Step 1
    Widen the crack to a minimum of 1/4 inch using a chisel and hammer (the edges of the crack should be vertical or beveled in an inverted “V”).

    Step 2
    Break away any deteriorating concrete and remove loose material with a brush.

    Step 3
    Cut the tip of the nozzle on an angle with a utility knife to match the width of the crack and load into a standard caulk gun.

    NOTE: for large cracks over 1/2 inch deep, a backer rod should be placed in the crack before applying the sealant.

    Step 4
    Slowly draw the gun along the joint forcing a bead of concrete repair caulk deep into the crack.

    Step 5
    Remove excess material with a trowel immediately after placement.

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