Can you plane polyurethane from boards?
I just got several boards of nice reclaimed oak, about 1" thick x 6" x 10'. I was told they were taken from a very old door. They have a clear finish on one face that looks like poly. It's an old finish, but it pretty much covers every inch of the boards.
My question is whether I can run the boards through a planer to remove the layer of poly and maybe 1/16" or so, or do I have to use chemicals to remove the finish. I really do not want to do that. I'm concerned that the planer cutting through the poly might damage the surface of the boards, or the poly might dull the planer knives - or worse.
The situation is made more difficult (for me, anyway), because although it looks like poly, it might be something else. It seems to be pretty old.
Thanks in advance for your advice.