Insert a trowel between the concrete and the form and run it along the inside edge of the form. When the patch has set (see the manufacturer's instructions), remove the form and smooth or brush the surface of the patch as necessary to match the surrounding concrete. For wider and deeper cracks, backer rod can be used to fill the crack and reduce the amount of caulk needed. Most caulking is intended to be no more than ½ inch thick, so the backer rod helps ensure you can create the desired size/shape for your caulking.

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