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I recently made a desk with a concrete top. It was a little rough so I smoothed the top with a liquid mix of just cement and water.

I'm now preparing to finish it. I have a pot of water-based polyurethane left over from a previous project. This one. It doesn't mention masonry or concrete on the tin.

Is there any reason why this won't be appropriate for a concrete desk?

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There's no reason to think that won't work. Urethane can be used over almost any stable, non-soluble surface. I'm a bit concerned that your surface slurry resulted in a chalky finish that might tend to lift when you apply the urethane, but the first coat should seal it in.

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