How to Fill Concrete Gaps | ehow
Step 3. Place the tube of urethane caulk into a caulking gun. Press the trigger a few times to move the rod of the gun against the rear of the tube, locking it in place. Cut the tip of the tube with a utility knife to open it. Use an angled cut, about 45 degrees, and then turn the tube so that the angle points downward when applying the caulk.
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