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Thread: Better than JB Weld?

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    Supporting Member iofthetaiga's Avatar
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    Default Better than JB Weld?

    I recall a helicopter mechanic showed me some 2-part stuff about 15 years ago that was pretty amazing... but don't recall what it was.

    So, what's the best metal bonding agent, in the same category as JB Weld (bombproof, machinable, paintable...), known to mankind? Bonus points if it cures black in color.
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    Loctite has a product called black max if I remember correctly.
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    Quote Originally Posted by iofthetaiga View Post
    I recall a helicopter mechanic showed me some 2-part stuff about 15 years ago that was pretty amazing... but don't recall what it was.

    So, what's the best metal bonding agent, in the same category as JB Weld (bombproof, machinable, paintable...), known to mankind? Bonus points if it cures black in color.
    I've used a bunch and for what you're asking (bombproof, machinable, paintable...) I'd suggest Devcon 10110. It's not the best adhesive (it's very, very good, but there are better epoxy "glues"), but its durability and machinability are absolutely top shelf. Properly mixed, it has nearly immeasurable shrinkage, and has become a staple for me in rifle bedding. I use it on all kinds of other stuff when these same properties are needed. It is a more finicky to mix, especially with regard to its ratio, but with an accurate and precise scale it is easy enough. I've used the steel variety most, but I've also used the stainless(10270) and titanium (10760) versions. The titanium is wildly expensive and while it's lighter and supposedly more durable, I'll not pay for the difference again. The SS also has improved ratings, but at double the cost I just keep using the 10110. It cures dark, but not black and it doesn't dye very well IME either. 10110 will dull metal cutting bits and blades and will also readily tap for screws and bolts.
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    Metal Set

    http://www.aircraftspruce.com/catalo...illedepoxy.php

    Metalset A4 is a powerful epoxy adhesive that has been used for years by all branches of the U.S. Military as well as every major airline and auto manufacturer in the world. A4 is used for hundreds of industrial bonding applications and offers excellent adhesion to porous or non-porous surfaces. It can be applied to vertical surfaces without sagging and cures overnight with negligible shrinking.

    Once cured, A4 offers good machining qualities (sanding, drilling, tapping), and resists alkalies, dilute acids and solvents. Applications include stopping leaks in pipes, valves and tanks (i.e. car gas tanks), bonding like and unlike surfaces, filling metal joints, dents, etc., anchoring bolts in wood, concrete, and repairing metal surfaces.

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    Supporting Member iofthetaiga's Avatar
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    Thanks so far. To clarify; I am also/especially interested in superior adhesion/bonding properties.
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    Supporting Member iofthetaiga's Avatar
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    Sounds like I need to find some A4. Thanks FP.
    ...he who knows nothing is nearer to truth than he whose mind is filled with falsehoods & errors. ~Thomas Jefferson
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    I'm a helicopter mechanic. I'll bet he showed you EA 934 NA. The NA stands for non asbestos. Check out the links below.

    http://www.henkelna.com/product-sear...=8797799743489

    https://tds.us.henkel.com/NA/UT/HNAUTTDS.nsf/web/B8D891E40C3704B98525715C001BD4DD/$File/Hysol_EA_934NA-EN.pdf

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    wally wotld carries some 2 part putty, maybe liquid steel or something, can't remember it's name. Its grey when firm and works great, seals cracks on pumps, stripped threads, radiator holes, etc..
    Reasonsble and easy to find, I carry some in each toy now as it has saved us more than once.
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    Quote Originally Posted by KWP View Post
    I'm a helicopter mechanic. I'll bet he showed you EA 934 NA. The NA stands for non asbestos. Check out the links below.

    http://www.henkelna.com/product-sear...=8797799743489

    https://tds.us.henkel.com/NA/UT/HNAUTTDS.nsf/web/B8D891E40C3704B98525715C001BD4DD/$File/Hysol_EA_934NA-EN.pdf

    I was a helicopter mechanic for 20 years and we was metal set and hysol,, 934 being the stronger of the 2.

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    Yes Sir....Metalset A4 works great, but I'm interested in trying something better. Any idea what heat range EA 934 is good for?
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    http://www.google.com/url?sa=t&rct=j...yhpOROj33yPBuA


    try belzona products, used belzona "molecular" at the heavy equipment dealership for many years, works well.

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    I have used Marine-Tex for years. The gunsmiths for the Marines put me on to it many years ago.
    http://stuccu.com/s/Marine+Tex+Epoxy...8e3c8&device=c

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    3M panel bonding adhesive. Cures in black. It's not cheap though.

    http://3mcollision.com/3m-panel-bond...ive-08115.html

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    Quote Originally Posted by MountainMariner View Post
    3M panel bonding adhesive. Cures in black. It's not cheap though.

    http://3mcollision.com/3m-panel-bond...ive-08115.html
    I know nothing about this goo but this here gives me pause.
    "This product is not intended to bond structural components of a vehicle such pillars, rockers, or frame members. If doubt exists as to whether a particular component is structural, then that component should be welded."

    I just spent half an hour reading data and comments on it and found nothing at all about its machinability. I'd think it pretty iffy using it for much more than a glue at .053" thick because 3M has nothing in their data about it other than that and if it's in any way comparable to JB Weld (a competing company) I doubt 3M would be missing that marketing strategy.



    Better than JB Weld is a tall order but mostly it's missing some important information . . . better than JB at what, what is it are we trying to do?

    JB is just pretty dang good and likely the best at some jobs but nothing is the best at everything. Just last night I was working at my brother in-law's shop repairing an aluminum fixture I built over 20 years ago. All the threads where the part bolts to the fixture are warn out in the aluminum from bolts going in and out, all but one that is. The one hole that is still good was a hole I drilled with the wrong over size drill and repaired by filling with JB and taping the JB 1/4-20. So JB Weld holds thread better than 6061 aluminum, a lot better in fact.
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    Best stuff I've ever used is called Splash Zone. 2 part compound that can even be applied underwater. Originally designed to patch holes and cracks in Dutch dams. http://pettitpaint.com/product.asp?id=191

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