re: Woodworking boys, what’s the best top coat for oak stair treads?

quote:

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Floor grade polyurethane


This. A couple of coats

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Yep. You might think about 3 or more coats. We put down hickory and the floor just drank the first coat right up. The second wasn't quite enough IMO. In your case, it wouldn't be a big deal to sand and add a coat every couple of years if they start to look worn.