i built a strong room years ago out of 200 series blocks and a 10 mm steel door. It got damp so i painted it on the inside with polar coat which penetrated the concrete and sealed it so no more problems
i built a strong room years ago out of 200 series blocks and a 10 mm steel door. It got damp so i painted it on the inside with polar coat which penetrated the concrete and sealed it so no more problems
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