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Gold Member
If this stuff is so good why not use it instead of casting ? [Broken]

For small batch work, it seems ideal, i have seen other products that claim
to be equal to this, ie one that repairs stainless steel, even shafts, there
must be some (hype) in the claimed properties of these products ?
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Gold Member
It would appear to be essentially the same as JB Weld, without the mixing requirement. If so, then it's not nearly as easy to work with as they'd have you believe. Patching something with JB involves a lot of effort to make sure there aren't air pockets or other gaps. I've also found that, contrary to the advertising, it's not prone to accept drilling, tapping, filing etc. without crumbling.


Science Advisor
Its not the same as JB Weld, different viscosity. Sure there's marketing hype, and the MSDS has plenty of haz warnings, and you really should check out its hardness/abrasion resistance before buying too far into the hype.

JB Weld has worked well for me, drilled and tapped before but it was an encapsulated patch so it kept the material completely in compression during those operations. Great stuff, not many other ways to patch stuff, its like duct tape that lasts longer.... :smile:


Staff Emeritus
Science Advisor
I imagine Lab Weld could be used for supeficial repairs, but in high stress or fatigue susceptible applications, I doubt it would be satisfactory.

I can't imagine repair a pump shaft for example.

It all comes down the service environment.


Gold Member
Cliff_J said:
JB Weld has worked well for me
Me too, in many applications. It's possible that I didn't mix the bad batches as well as I should have, or got too much skin oil in them while kneading. Besides the crumbling under tool use, I've had some that absolutely refused to stick to the material that I was trying to repair (and it wasn't anything exotic).
Probably good enough for quick and dirty patching/repairs, usually temporary. Keeps you going 'til new part arrives.
Personally I like the epoxy putty, various brands. Just cut what you need off, knead it and shape it. I've used it for holes in panels mostly. Recently used it to repair a valve and the worn end of a pump impeller. Both seem to be doing well.
Danger: Hint, clean the surface really well. Then slightly roughen and clean again. Leave no oil, rust or emery behind.


Gold Member
Thanks for the tip, Kleinjahr. I do tend to be a bit lazy when it comes to cleaning stuff. :redface:

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