Can you plane polyurethane from boards? - Woodworking Talk - Woodworkers Forum
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post #1 of 12 Old 11-08-2016, 09:17 AM Thread Starter
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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.
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post #2 of 12 Old 11-08-2016, 09:34 AM
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Yes, you can run it through the planer to remove the finish and reflected the piece. The poly will wear on the knives a little, but it works fine.

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post #3 of 12 Old 11-08-2016, 06:08 PM Thread Starter
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Thank you, Al_Amantea! I'll give it a try.
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post #4 of 12 Old 11-08-2016, 06:39 PM
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Poly should be pretty easy on the knives, easier than the wood is. It's just plastic after all. Paint will kill them though, especially white paint. The titanium dioxide (I think) used as a pigment tears the blades up

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post #5 of 12 Old 11-08-2016, 09:08 PM
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I think poly would wear on the knives a lot. I've quit trying to surface any wood with any finish because it isn't worth the damage to the knives.
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post #6 of 12 Old 11-08-2016, 09:44 PM
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You need a spiral head for your planner. I have one and plane paint and poly. I use alot of reclaimed lumber. The was pretty expensive but worth to me because I plane mostly reclaimed lumber.
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post #7 of 12 Old 11-09-2016, 06:07 AM
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I don't think the poly will necessarily dull the knives, but it might gum them up. I have a theory that if you take a deep enough cut, that the planer will cut more wood than finish, reducing the tendency to gum up.
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post #8 of 12 Old 11-10-2016, 05:39 PM
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Quote:
Originally Posted by Quickstep View Post
I don't think the poly will necessarily dull the knives, but it might gum them up. I have a theory that if you take a deep enough cut, that the planer will cut more wood than finish, reducing the tendency to gum up.
Possible, and I get where you're going with this, but I don't believe there would be a difference. Any paint or other film finish on lumber will always contact the knives first, and if abrasive enough, will continue to affect them no matter the depth of cut.

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post #9 of 12 Old 11-11-2016, 10:00 AM
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I never run lumber through a planer to remove a finish.
The old finish can gum-up on the blades. Any time saved by the process is lost to clean the planer.
I think nice saw a guy try to remove Formica by running it through a planer. A very dumb thing to try.

If you don't have time to do it right the first time, when will you have time to do it over?
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post #10 of 12 Old 11-12-2016, 07:20 AM
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Quote:
Originally Posted by Toolman50 View Post
I never run lumber through a planer to remove a finish.
The old finish can gum-up on the blades. Any time saved by the process is lost to clean the planer.
I think nice saw a guy try to remove Formica by running it through a planer. A very dumb thing to try.
I can imagine that didn't end to well for the planer, the board, or the guy!

Ouch

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post #11 of 12 Old 11-12-2016, 07:44 AM
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I hope emsennett posts his results in surfacing the wood.
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post #12 of 12 Old 11-12-2016, 02:12 PM
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Quote:
Originally Posted by Steve Neul View Post
I hope emsennett posts his results in surfacing the wood.
So do I

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