If you apply a water based urethane over an oil based wood filler it will most likely turn yellow or at least not match the color that you started with. I’ve actually learned this the hard way a few times but I had no idea what actually caused it. So, a painter suggested that next time I apply the urethane prior to filling any holes. Get all your coats of urethane applied, all the sanding and preparation done. Then go back at the end and apply the oil based wood filler. You know what…..it works fantastic! Next time you’re working with urethane give this a try, I think you’ll be very impressed.
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I have found that most urethane finishes will yellow a little bit over time. For my last furniture project I used teak oil, which is a rub on finish, and it came out great. A lot of work though.
The one thing that I always liked about polyurethane is it is pretty darn tough. The Spar Urethanes have been great on the living room furniture with the kids, no worries about spills and such because they are water proof.
How does the water based product stand up?
What a good tip! I wouldn't have thought of that.