birch countertop: how many coats of polyurethane?

I put up a sideboard work surface in my office and applied three coats of water-based satin polyurethane (light sanding between coats). Is three coats enough? Some computer equipment will be sitting on it, as well as papers, and the occasional coffee mug.

Reply to
nosredna
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that'll be fine. >I put up a sideboard work surface in my office and applied three coats

Someday, it'll all be over....

Reply to
Tom

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