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How to resolve an issue with stained concrete blocks

20 days ago

My husband made a benchseat in our courtyard which has a base made from concrete blocks. Unfortunately the concrete sealer used was out of date and caused permanent staining on the blocks which cannot be rectified (we have sort professional advice). We would appreciate any suggestions to rectify the appearance of the blocks - options include adding fake stone cladding over the bricks or rendering over the bricks. Any other thoughts appreciated or other products available. Note: Photos were just taken after the rain today hence the wet pavers.

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