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What should epoxy look like after being heated
http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=49745		 Page 1 of 1
Author:  bcombs510 [ Sat Sep 23, 2017 12:53 pm ]
Post subject:  What should epoxy look like after being heated
Hello,

Today I had the pleasure of removing threaded rod from a ukulele neck that I had epoxied into place using System Three epoxy. (It's a long story but I botched the placement) I put a heating iron on the rod and let it sit for about 10 minutes. I then was able to basically "unscrew" the threaded rod.

I was surprised to see this white fluffy material in the hole. I don't know if the epoxy only partially set or if that is what it looks like after being heated up? Anyone have experience with that?

Image

Brad
Author:  bcombs510 [ Sat Sep 23, 2017 2:56 pm ]
Post subject:  Re: What should epoxy look like after being heated
Also, epoxy will stick to itself, correct? Or will I need to widen the hole, plug it and redrill it?


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Author:  Imbler [ Sat Sep 23, 2017 3:51 pm ]
Post subject:  Re: What should epoxy look like after being heated
I would hazard a guess that since you glued in the threaded rod it was a net fit with the epoxy, and as you unthreaded it (a whole lot of turns) it scraped the epoxy and the white fluff is "epoxy filings"
Mike

bcombs510 wrote:
Hello,

Today I had the pleasure of removing threaded rod from a ukulele neck that I had epoxied into place using System Three epoxy. (It's a long story but I botched the placement) I put a heating iron on the rod and let it sit for about 10 minutes. I then was able to basically "unscrew" the threaded rod.

I was surprised to see this white fluffy material in the hole. I don't know if the epoxy only partially set or if that is what it looks like after being heated up? Anyone have experience with that?

Image

Brad
Author:  david farmer [ Sat Sep 23, 2017 4:29 pm ]
Post subject:  Re: What should epoxy look like after being heated
That's definitely the look of roasted epoxy. Probably has a smell like death on a stick, right? I don't think roasted epoxy is epoxy anymore.
Epoxy is all mechanical bond. I'd get that crap outa there. You need some surface roughness and/or penetration into surrounding wood.
A dowll is a perfect long grain fill so plugging and starting fresh would be tempting.
Author:  bcombs510 [ Sat Sep 23, 2017 4:33 pm ]
Post subject:  Re: What should epoxy look like after being heated
Perfect. Thanks for that! I will plug it. The hole is just a smidge too big for a 5/16" dowel so I'll go a step bigger and cut a Mahogany plug for it. Appreciate the help!!


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Author:  Haans [ Sat Sep 23, 2017 5:26 pm ]
Post subject:  Re: What should epoxy look like after being heated
Brad, you need to enlarge the hole to make sure you will be "wood to wood". I would be wary of using epoxy to glue in a plug. I would absolutely use a mahogany plug and try to orient the grain in the same fashion as the hole. You can turn a plug on a drill press. I would glue it in with hide glue, but Elmer's woodworker's glue is also good. make sure the fitting is not REALLY tight, allow for the glue.
I have never had any use for epoxy except for inlay filler mixed with tempura powder or sanding dust...
Author:  bcombs510 [ Sat Sep 23, 2017 6:08 pm ]
Post subject:  Re: What should epoxy look like after being heated
Thanks! I did open up the hole to 3/8 and cut a plug for it out of Mahogany. I didn't do a great job aligning the grain though. :( I put it in with titebond.

But, here it is... all plugged up with some additional relief chiseled in. I'll do a little flossing tomorrow and then drill a new hole for the threaded rod. Here's to hoping I don't botch the placement again!!

Image


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Author:  Haans [ Sat Sep 23, 2017 6:14 pm ]
Post subject:  Re: What should epoxy look like after being heated
Looks good Brad...
Hopefully the new hole won't fall on the joint.
Author:  George L [ Sat Sep 23, 2017 7:30 pm ]
Post subject:  Re: What should epoxy look like after being heated
I've never built a ukelele, but that that looks good to me. Heck, I'd be confident about proceeding even if it were for a guitar.
Author:  klooker [ Sun Sep 24, 2017 11:02 am ]
Post subject:  Re: What should epoxy look like after being heated
Regarding epoxy sticking to itself.

According to this article, the ability diminishes the more cured the old epoxy is.

http://www.westsystem.com/instruction-2 ... -clamping/
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