Using Polyurethane On Concrete Countertops. Many concrete countertop makers apply wax over acrylics. Most polyurethanes are moisture intolerant until they cure, so they should not be applied to surfaces if any.
The answer to this question depends entirely on the sealer used.
Use these high-build sealers to produce a very durable, chemical-resistant finish.
StoneLok™ "MLT Plus" Polyurethane Sealer
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Another benefit of using a bagged concrete mixture is consistency. QUIKRETE Polyurethane Concrete Crack Sealant is perfect for this job, since it matches the color and texture of concrete and remains flexible after it dries. Custom Concrete Countertops: Pro Planning Guide.