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Subject: Unwelding JB-weld

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Zeke (OR)    Posted 12-02-2020 at 13:16:01 [URL] [DELETE]        [Reply] [No Email]  
  • Unwelding JB-weld
  • So I put a medallion on my gate with JBWeld, and thanks to poor preparation it fell off. Now there is a ring of epoxy where the glass used to be. Half of it has flaked off but the other is living up to advertising.

    What can I do to remove the remaining epoxy short of a small thermonuclear weapon?

    The gate is powder-coated metal.

    Zeke

    Mower    Posted 12-04-2020 at 07:07:08 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Unwelding JB-weld
  • If you look at the JB Weld site, you'll find a facts page. On that facts page is the process to remove fully cured JB Weld. Hint: there is no magic solution, and JB Weld isn't anything like a Styrofoam cup.

    Tim Daley(MI)    Posted 12-04-2020 at 06:45:14 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Unwelding JB-weld
  • Sometimes the simplest solutions are the most obvious. I'm not saying this will work or not, but I've had stuff like PB Blaster dissolve things, some unintentionally, and plain old gasoline will dissolve many substances too - look at paint. Take a Styrofoam cup and pour a tad of gas in it. Careful to stand out of the way as it will disintegrate the cup on impact. If you prepped/mixed the JB correctly with substance and catalyst hardener, it wasn't anything you did. Sometimes plain Superglue will work too.


    Tim Daley(MI)

    Bruce Dorsi    Posted 12-03-2020 at 09:47:36 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Unwelding JB-weld
  • Your medallion failure may not have been due to poor preparation, but by poor choice of adhesive.

    Glass and steel have different coefficients of expansion as the materials react to temperature changes. ...I suspect the JB Weld did not accommodate the difference.

    I once tried gluing a ridgid plastic nameplate to flat stainless steel. ...Several attempts using different adhesives failed. ...Silicone caulk/adhesive was the final attempt and was successful.

    The silicone was flexible enough to absorb the expansion & contraction of the stainless, which was greater than the expansion & contraction of the plastic.

    Gaspump    Posted 12-03-2020 at 12:48:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Unwelding JB-weld
  • Right you are. 3M 5200 marine sealant/adhesive works in those situations. Back in my shipbuilding days we even used it to hang stainless steel windows to steel or fiberglass superstructures. Bolts too but if one had to be removed the bolts came out but the window frame still hung on extremely tight and it took a heck of a lot of effort to remove it.

    Bruce(OR)    Posted 12-03-2020 at 07:52:06 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Unwelding JB-weld
  • Your description is a bit vague. Glass on metal? 'poxy off what? metal or glass?
    Chisel works.
    You did a search on this already, right? How to remove JB WELD?

    Zeke (OR)    Posted 12-03-2020 at 12:15:26 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Unwelding JB-weld
  • Right..... glass medallion steel powder coated gate. JBWeld epoxy. Epoxy sticks to part of gate.

    Extreme temp changes are probably at the bottom of the problem, but I have to clean the
    Powder coat before I can try again.

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