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How To Make Cinder Blocks Molds

Jan 16, 2019nbsp018332Marty chose pre-mixed high-strength concrete mix for his castings. Since the original blocks were hollow, he inserted an open-ended box in the mold, which he centered and screwed to the base to keep secure. To allow for expansion of the new concrete casting, and to make removal easier, he wrapped this box with 18quot sill-seal closed-cell foam.

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