Safe Walking on Acid Washed Concrete

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I am having a vendor acid wash some large rectangular concrete stepping stones. They look great, but when it rains they are a little unstable. Is there any chemical sealer that can be applied to acid washed concrete that would make the surface "rough" and more likely to grab onto a shoe that slides across the surface? The solution has to be one that would last for many years.

[Hot-Text]

Thompson's WaterSeal

Clear Multi-Surface Waterproofer