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Author Topic: Removing J-B Weld  (Read 1255 times)

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Offline Oquirrh

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Removing J-B Weld
« on: May 21, 2005, 07:36:11 PM »
I use JB weld for bunches of stuff, including semi-permanently putting receiver sights and scope mounts on older rifles. I really holds well.

Seems like a good way to put a scope on, for instance, without permanently reducing any value the rifle might have by drilling and tapping.

That is--if you can get the stuff off without damaging the finish!

Any suggestions??
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Offline gunnut69

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Removing J-B Weld
« Reply #1 on: May 22, 2005, 09:43:29 AM »
J-B Weld is basically an eposy so heating the metal to 200-250 should destroy the bond and free the parts without any damage.  As a note these temps can be reached in the summer in some closed automobiles so beware..  Also I can't vouch for what happens under the bond.  Will the steel oxidize?  I have seen bonded sights fail before..
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Offline Oquirrh

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thanks, g-nut
« Reply #2 on: May 22, 2005, 12:05:20 PM »
FYI, another suggestion i got was to spray liquid nitrogen on the bond and rap it with a hammer.

I know that epoxying sights on isn't very elegant, but it's nice to at least try a scope out on a plinker before you put $18 per hole into drilling and tapping.

BTW, i've had about 50 percent succes over time with J_B mounts. So I wouldn't want to count on one in the middle of a hunt or competition.
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Offline Kragman71

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Removing J-B Weld
« Reply #3 on: May 24, 2005, 09:23:59 AM »
Oq,
I used to work with epoxies before Retirement,and we used methaline chloride to dissolve it. Add 5% methanol for faster action.
You can find it inold cans of paint cleaner.Newer cans will not have it because it is hazardous to your health.
If you chooseto use it,do so in a wllventilated place.
Frank
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Frank

Offline michael orlen

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Removing J-B Weld
« Reply #4 on: May 24, 2005, 10:24:52 AM »
J B Weld is good stuff, but I seriously doubt it will hold a scope base on a rifle for long. It will not expand and contract at the same rate as steel and its bond will be weakened; a little bit of recoil and I'm quite sure you'll find your scope on the ground.....
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Offline CowboyEngr

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JB weld scope on
« Reply #5 on: May 25, 2005, 10:41:51 AM »
I have an old Mdl 46 Husqvarna in 9.3x62 and requested a local "gunsmith" drill and tap for a scope mount.  It was a disaster and a total botch.  After much thinking I attempted to JB weld the mount to the receiver rings.  It didn't work.  After 4-5 shots, the scope,rings, and mount hit the ground.  Of course, the 9.3x62 is no pussycat with recoil, so something lighter might work for a while.  Just my experience.
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Offline CowboyEngr

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follow up...
« Reply #6 on: May 25, 2005, 10:45:42 AM »
But, to answer your real question......when the scope popped off, the finish on the receiver ring was as good as before.  Just had those botched holes to look at! :(
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