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What to do about glue?

PostPosted: Tue May 14, 2019 7:09 pm
by Tubajug
The neck on my helicon has some cracks in it that were sealed up with some sort of glue. What might I try to remove that? I torched a little bit of it just getting the brace and receiver off. Is there some solvent I could try? Grind it off? Torch it off?

I'm trying to salvage the neck either by patching it or brazing the cracks.

Re: What to do about glue?

PostPosted: Wed May 15, 2019 6:13 am
by Tubajug
I took the less health - conscious approach and just torched it to blacken it, then sanded it off. Probably not the best approach, but it worked.

Re: What to do about glue?

PostPosted: Wed May 15, 2019 11:18 am
by the elephant
One of my biggest peeves is techs who use superglue. You cannot see it. If you inhale the fumes from burning it you can end up in the ER. This has happened to me twice and the second time put me in bed for three days. Always try to identify what you hit with a flame. Most stuff is burnable (or meltable) junk. Some clear cements and glues are heinous if you burn them, though. Please be very careful. I have found that acetone can remove many so-called superglues (here are many kinds) with work. It also can remove lacquer, so I do not generally use it. If you know exactly what it is, call that company's 800 number for help. If you don't I would advise acetone on a cotton swab, time, and a very sharp scraper. Do not get a dry cotton swab mixed with the softened glue or it can ignite. Keep it very wet with the acetone. Likewise, do not do this over cotton flannel for the same reason.

Note the info on acetone.

https://en.wikipedia.org/wiki/Cyanoacrylate#Solvents_and_debonders

Re: What to do about glue?

PostPosted: Wed May 15, 2019 12:26 pm
by Tubajug
Thanks for the info. I was probably a bit hasty, but wanted to get it done. I'll certainly be more careful in the future. I figured it was ok when I toasted a little bit of it removing the receiver and it just melted, crisped up, then flaked off. Now to braze and/or patch all the cracks...

Re: What to do about glue?

PostPosted: Wed May 15, 2019 10:12 pm
by bloke
There are very few glues (total: 0) that hold brass worth a crap (thus: "soldering").

Glues on brass instruments can usually be wiggled apart.

Not bragging on super-human strength (but just sayin') My fingers are probably the strongest parts of my body...so far: no arthritic symptoms...and I tend to use them as "tools". I'd probably wiggle something like that apart, throw the freed part in the lacquer stripper, and see what happens.

Re: What to do about glue?

PostPosted: Thu May 16, 2019 6:36 am
by Tubajug
The glue wasn't holding anything together, it was just what they used to seal up some cracks in the neck. I'll post some pictures later (probably in my helicon thread). I'm just going to try my hand at salvaging this neck, so I needed all the glue off first.

Re: What to do about glue?

PostPosted: Thu May 16, 2019 8:13 am
by bloke
Would it have scuffed off with a razor blade?

Re: What to do about glue?

PostPosted: Thu May 16, 2019 11:53 am
by Tubajug
Possibly, the only trouble would have been that the brass underneath is very dented and "wavy," not much of a "straight shot" with a razor blade.

Re: What to do about glue?

PostPosted: Thu May 16, 2019 10:30 pm
by bloke
If you have access to Allied Supply (friendly local music store?), just throw in the garbage and make a new neck.

Re: What to do about glue?

PostPosted: Thu May 16, 2019 11:11 pm
by Tubajug
Using the prefilled leadpipes? I've thought about it. I wrapped it all up in tape, just to see if the cracks really were the cause of the leaky/stuffy playing, but something else is going on. It still played really stuffy. I've flushed it with water and blown compressed air into the bugle through the large side of the MTS, but still can't figure out what's going on... I should probably move this discussion over to my thread about the helicon since the glue portion has been taken care, but... I'm typing it here already....

Re: What to do about glue?

PostPosted: Fri May 17, 2019 4:20 pm
by bloke
Send your pet hamster down in there with a camera mounted to check for mud dauber nests...??

Re: What to do about glue?

PostPosted: Mon May 27, 2019 11:28 am
by Tanker_5455
Yeah, fixing excessive uses of cyanoacrylate glue by so called "techs" is one hell of a pain... The few times I did have to burn it, I made sure to do it outside, with noone around, and with a gasmask. Back when I worked at a factory (as a clerk though, I didn't do the hard job), an employee actually died because of CA fumes, so I've been extremely careful with it...