Polyurethane not drying? - Woodworking Talk - Woodworkers Forum

 
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post #1 of 10 Old 02-21-2010, 09:01 AM Thread Starter
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Polyurethane not drying?

I put two coats of this stuff:

http://www.minwax.com/products/oil_b...yurethane.html

on some birch ply and let it dry overnight. It is still super tacky to the touch. Do I just have to wait longer, or is it never going to dry? If it is never going to dry, can you remove it?

Thanks,

Dave
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post #2 of 10 Old 02-21-2010, 09:20 AM
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Temperature and humidity have quite a bit to do with drying times of most finishes. Urethanes generally take a little longer than most.
Give it another day or so.

Tony B



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post #3 of 10 Old 02-21-2010, 10:03 AM
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"I put two coats of this stuff:" how did you do that if it isn't drying? spray? was the first coat dry. like tony said, temperature in winter months might mean you have to turn the heat up.
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post #4 of 10 Old 02-21-2010, 10:34 AM Thread Starter
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The first coat wasn't TOTALLY dry, but I believe it was much dryer than the second. I put both coats on with a foam brush.

Ah, I didn't realize the temperature mattered so much. It has been out in my un-heated garage (and I'm in NY). I brought it inside, we'll see how it does in this temperature.

Dave
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post #5 of 10 Old 02-21-2010, 01:15 PM
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Quote:
Originally Posted by daviddoria View Post
The first coat wasn't TOTALLY dry, but I believe it was much dryer than the second. I put both coats on with a foam brush.

Ah, I didn't realize the temperature mattered so much. It has been out in my un-heated garage (and I'm in NY). I brought it inside, we'll see how it does in this temperature.

Dave
I'll betcha that'll make all the difference. I had the same problem a couple weeks ago when i was finishing a toy fire truck. In frustration I brought it inside and put it in our furnace room. Dried hard and fast.
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post #6 of 10 Old 02-23-2010, 11:45 PM
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Poly not drying solution.

You did not say where you live, but in some states such as California Minwax uses a different formula for thier poly in order to comply with environmental regulations. I ran into the exact same problem with a floor that would not dry. What happens is this.....Poly is supposed to harden as the thinner evaporates but in your case the thinner in the can probably evaporated too quickly for it to harden due to humidity or temperature conditions. What you need to do is apply a thinner or mineral spirits to the finish. When I did this with my floor I wiped it on with a soft cloth. As the additional thinner evaporated the poly hardened . You may want to repeat this process a couple times, but it will work. You should notice results withing 24 hours of wiping of the spirits. Hope this helps you.

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post #7 of 10 Old 02-24-2010, 08:09 AM Thread Starter
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Interesting Rory, I'll keep that in mind.

Update - After 15 hours in the cold garage, it was still very tacky. I brought it inside, and it was totally dry within 2 hours!! I guess I'll setup all my drying areas inside from now on :)

Dave
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post #8 of 10 Old 02-24-2010, 08:43 AM
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Quote:
Originally Posted by daviddoria View Post
Interesting Rory, I'll keep that in mind.

Update - After 15 hours in the cold garage, it was still very tacky. I brought it inside, and it was totally dry within 2 hours!! I guess I'll setup all my drying areas inside from now on :)

Dave
If you look on the can it should be spelled out. Do not store or use below this temperature usually like 50* I think. I often wondered how you guys in the north got around stuff like that. Most of that stuff is meant to be used outside or with a well ventilated room which I guess would be below 50* most of the winter.

Amazing how we overlook the simple stuff sometimes.
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post #9 of 10 Old 03-18-2010, 04:43 AM
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Originally Posted by rrbrown View Post
If you look on the can it should be spelled out. Do not store or use below this temperature usually like 50* I think. I often wondered how you guys in the north got around stuff like that. Most of that stuff is meant to be used outside or with a well ventilated room which I guess would be below 50* most of the winter.

Amazing how we overlook the simple stuff sometimes.
Yeah, I think too.. It's the temperature..
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post #10 of 10 Old 03-18-2010, 06:59 AM
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Quote:
Originally Posted by daviddoria View Post
The first coat wasn't TOTALLY dry, but I believe it was much dryer than the second. I put both coats on with a foam brush.

Ah, I didn't realize the temperature mattered so much. It has been out in my un-heated garage (and I'm in NY). I brought it inside, we'll see how it does in this temperature.

Dave

Each application of a finish should be dry completely before recoating. For oil base finishes I would rather use a wipe on variety, or to brush on with a good natural hair brush (like badger hair). I find using a foam brush has the tendencies to put too much or not enough down, prone to make and/or leave bubbles, and difficult to draw out the finish.






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