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How to polyurethane a floor 
Choose water-based polyurethane for a faster drying time. 
Water-based polyurethane looks milky in the can but dries to a clear finish. It also has a low odor and dries more quickly than oil-based polyurethane.
If you're hoping to complete this project in one day, water-based polyurethane is the way to go. Select oil-based polyurethane to add a deeper hue to the existing wood.