Water based urethane over oil based urethane?

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Pat asked 10 years ago

How do I apply this new water based urethane over what I have been using for years?

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Crowder Painting answered.

I don't recommend applying a water based urethane over an oil base urethane. It is best to stick with the oil base. If you must use the water base urethane then a light sanding is needed to help with adhesion. You should also use a liquid sander/deglosser to help the new finish stick.