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Remove JB Weld?
Posted: Thu Feb 12, 2026 4:01 pm
by Amconk
Im fixing up an old student model horn, hoping to get it in playing condition to donate to a local school.
The water key appears to have at some point been very sloppily repaired using JB Weld. Whats the best way to go about removing it so I can properly solder the piece back together? Heat? Or just straight up grind and chisel?
Re: Remove JB Weld?
Posted: Thu Feb 12, 2026 4:13 pm
by BrassSection
If it was properly mixed and applied, that stuff is tough. Dremel used carefully will probably be your best bet. Fine cutting wheel, but need to remember much contact or the cutter with brass will leave you a hole in no time.
Re: Remove JB Weld?
Posted: Fri Feb 13, 2026 2:03 pm
by walldaja
New crook.
Re: Remove JB Weld?
Posted: Fri Feb 13, 2026 2:41 pm
by JohnL
Attack Epoxy Remover is supposed to work, but it's really nasty stuff.
You could try soaking the crook in acetone for a few days; that's supposed to soften the the epoxy up to the point where the parts can be separated and the epoxy scraped off.
Re: Remove JB Weld?
Posted: Fri Feb 13, 2026 2:51 pm
by ghmerrill
A butane torch (or even a butane lighter) should do just fine if you simply want to remove it. Don't breathe the fumes.
If you don't like the torch idea, a heat gun should do it. Again, be careful about the fumes. If you want to actually clean the epoxy off it, you'll need to use some sort of repeated heat/scrape approach, or some careful sanding.
(Getting a heat gun several years ago was one of the best tool acquisitions I've made. It's surprising how handy -- and relatively safe -- a heat gun is. I use it a LOT more than I ever expected to.)
Re: Remove JB Weld?
Posted: Sat Feb 14, 2026 11:38 am
by Amconk
https://www.facebook.com/share/p/1AbE9Q ... tid=wwXIfr
Here’s a link to my Facebook post with the pictures.
Surprisingly I’m taking a lot of flack for my post, with many people telling me I shouldn’t knock the original attempted repair. Agree to disagree… I guess.
Re: Remove JB Weld?
Posted: Sun Feb 15, 2026 5:30 pm
by tbonesullivan
ghmerrill wrote: Fri Feb 13, 2026 2:51 pm
A butane torch (or even a butane lighter) should do just fine if you simply want to remove it. Don't breathe the fumes.
If you don't like the torch idea, a heat gun should do it. Again, be careful about the fumes. If you want to actually clean the epoxy off it, you'll need to use some sort of repeated heat/scrape approach, or some careful sanding.
(Getting a heat gun several years ago was one of the best tool acquisitions I've made. It's surprising how handy -- and relatively safe -- a heat gun is. I use it a LOT more than I ever expected to.)
Hopefully they used "regular" epoxy. JB weld is pretty high temperature, so you really need to cook it to get it off.
Re: Remove JB Weld?
Posted: Sun Feb 15, 2026 6:29 pm
by JLivi
And here I thought there was a member named JB Weld and we were going to discuss if we should remove them from TromboneChat
Re: Remove JB Weld?
Posted: Mon Feb 16, 2026 5:42 am
by boneberg
JLivi wrote: Sun Feb 15, 2026 6:29 pm
And here I thought there was a member named JB Weld and we were going to discuss if we should remove them from TromboneChat
Love it!
Re: Remove JB Weld?
Posted: Mon Feb 16, 2026 7:10 am
by sdenlinger
Isn't JB Weld Tuesday Weld's lesser known younger brother? (One for the grandads.)
Re: Remove JB Weld?
Posted: Wed Feb 18, 2026 9:34 am
by Amconk
sdenlinger wrote: Mon Feb 16, 2026 7:10 am
Isn't JB Weld Tuesday Weld's lesser known younger brother? (One for the grandads.)
Once removed…
Re: Remove JB Weld?
Posted: Fri Feb 20, 2026 12:17 pm
by BarryDaniels
I just removed some JB Weld from a Conn by chipping it away with a triangular scraper. Took a while but it came off cleanly.
Re: Remove JB Weld?
Posted: Fri Feb 20, 2026 1:32 pm
by ghmerrill
BarryDaniels wrote: Fri Feb 20, 2026 12:17 pm
I just removed some JB Weld from a Conn by chipping it away with a triangular scraper.
Was that on a nickel or a yellow brass surface?
Re: Remove JB Weld?
Posted: Sun Feb 22, 2026 2:51 pm
by BarryDaniels
It was a nickel plated receiver where the bell brace had been sloppily glued. I was tapping on a stuck f-attachment slide and three places where glue had been used cracked and suddenly the bell came loose from the other side. Kind of a surprise.
Re: Remove JB Weld?
Posted: Sun Feb 22, 2026 3:06 pm
by ghmerrill
BarryDaniels wrote: Sun Feb 22, 2026 2:51 pm
It was a nickel plated receiver where the bell brace had been sloppily glued.
Ah! ... Yeah, I could see doing that chipping approach with the triangular scraper (carefully) on nickel. I'd be pretty leery of doing it on (much softer) brass.
Re: Remove JB Weld?
Posted: Sun Feb 22, 2026 4:21 pm
by BarryDaniels
Come to think of it, the joint of the f-attachment tube to the gooseneck where the two tubes are rubbing against each other, was also JB Welded and got scraped clean. It was definitely softer base metal, being raw brass, but wasn’t a lot different than the nickel.