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If you live in a cold climate where the blocks are at risk of cracking from the freeze/thaw cycle, then I would recommend using a caulk that is specifically designed for concrete block. The color of the caulk will be pretty close to the color of unpainted concrete when it cures, and isn't very noticeable. I repaired a few cracks in my garage with the same ...


Before you patch it, I would recommend making sure it isn't moving any more. One common method is to epoxy a small piece of glass across the crack; if the crack is moving, it will break the glass.

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