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| Bridge glued with polyurethane http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=24113 |
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| Author: | Cecil [ Fri Oct 09, 2009 9:53 am ] |
| Post subject: | Bridge glued with polyurethane |
Anyone have any experience with getting this glue to release? The bridge on my current project was replaced with what appears to be polyurethane glue(the foamy stuff). I don't know if it will respond to heat as other more traditional glues do or if it has to be treated differently. Anyone have any experience with this product? I sure could benefit from your knowledge. Cecil |
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| Author: | Mark Groza [ Fri Oct 09, 2009 11:14 am ] |
| Post subject: | Re: Bridge glued with polyurethane |
If worried about having to use too much heat to remove that bridge,you could always do it with another method.You can work a chisel around the edge and shear it off or if not worried about using the same bridge, just router it off useing two rails on either side of the bridge.Polyurethane takes more heat to remove which can scorch the top. |
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| Author: | Chris Paulick [ Fri Oct 09, 2009 11:16 am ] |
| Post subject: | Re: Bridge glued with polyurethane |
From what I gather and have read in the past I think if the bridge was clamped on really well that you may have to chisel or cut it off. Hopefully he didn't do a good job of clamping it on. Might not have if he used that to glue it on in the first place. I could be mistaken though. Seems like it would be tricky not to mess up the spruce top when removing it. Hopfully someone who uses it will chime in. Mario would be a good one to ask as he has done some testing on the glues over the years. You might want to ask over at MIMF.com as he is always there and at times will post here . Edit: Mark you seemed to post just ahead of me. Have you used heat on poly glue before and if so how did it react? |
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| Author: | Michael Dale Payne [ Fri Oct 09, 2009 11:17 am ] |
| Post subject: | Re: Bridge glued with polyurethane |
not a good glue to use if repairability is in your design thought process. |
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| Author: | mateo4x4 [ Fri Oct 09, 2009 11:28 am ] |
| Post subject: | Re: Bridge glued with polyurethane |
I did a build with that type of glue once (I was curious how it would do) and had it start coming apart at the seams after sitting in my hot (very hot) car. You could probably get it to soften with heat, but it may be more than the wood can deal with. Pick up some gorilla glue (the fast white and the slower dark both) and test it out a few times first. -Matthew |
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| Author: | Cecil [ Fri Oct 09, 2009 12:04 pm ] |
| Post subject: | Re: Bridge glued with polyurethane |
Michael, you are correct. It is not what I would use either but someone has and I have to deal with it. It sounds like heat might work, judging from Matthew's experience. I'll do some test first. I just thought that if any of our members had dealt with this stuff before I might save some time. Cecil |
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| Author: | Chris Paulick [ Fri Oct 09, 2009 12:49 pm ] |
| Post subject: | Re: Bridge glued with polyurethane |
It's like I said. This poly glue needs to be clamped very well and tight to work like it's suppose too. It's my understanding that it expands into the pores of the wood or something like that and binds the wood together very well. But if not clamped together well and not clean joints it isn't as strong. So you might have luck with the heat being that most wouldn't have used poly to begin with. Let us know what happens. |
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| Author: | MRS [ Fri Oct 09, 2009 3:55 pm ] |
| Post subject: | Re: Bridge glued with polyurethane |
I noticed this stuff a couple of times before but never bought it. Maybe i will to experiment. It says it can also remove polyurethane foams and glues...Mike http://www.liftoffinc.com/product-sealant-remover.php I actually use poly glue on a padauk electric body that titebond didn't work on to well. Its good for tropical and oily woods. A lot of double top classical builders use this stuff too. |
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