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Sure looks like a high gloss sealant to me. Clean the rock up and apply a high gloss concrete/masonry sealant to the other side and I bet you get a match. Or take a wire brush to they shiny sid...
Answer
Sure looks like a high gloss sealant to me. Clean the rock up and apply a high gloss concrete/masonry sealant to the other side and I bet you get a match. Or take a wire brush to they shiny sid...