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disolving epoxy?

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disolving epoxy?

Unread postAuthor: mtronic » Tue Sep 25, 2007 5:20 pm

Does anyone know if there is a solvent for epoxy? I managed to get some in the back of a valve stem :oops:
Thanks
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Unread postAuthor: fatcat » Tue Sep 25, 2007 5:29 pm

hydrochloric acid (sold as muriatic acid) could probably do it. It might damage the valve stem.
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Unread postAuthor: mtronic » Tue Sep 25, 2007 5:42 pm

hmm, interesting. WE have HCL acid for our pool. It may...I'll probably only need a drop or two, thanks mate.
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Unread postAuthor: boilingleadbath » Tue Sep 25, 2007 5:48 pm

Believe it or not, steel is an excellent solvent for the harder epoxies... just a quick application and it brushes right out.

...ahem... I presume you can't use a drill bit.

Which is too bad, because it means that you have to use REALLY nasty solvents... heated fuming sulfuric acid , fuming nitric acid, mixed acids, DMF, NMP... stuff like that.

All of which will destroy your valve stem in one way or another, besides being difficult and/or expensive to acquire.
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Unread postAuthor: goose_man » Tue Sep 25, 2007 6:17 pm

boilingleadbath wrote:All of which will destroy your valve stem in one way or another, besides being difficult and/or expensive to acquire.


Not to mention dangerous.
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Unread postAuthor: jackssmirkingrevenge » Tue Sep 25, 2007 11:03 pm

Have you tried pumping it to high pressure?
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Unread postAuthor: mtronic » Wed Sep 26, 2007 2:17 am

@ boilingleadbath: no need for the sarcasim, yes I can use a drill press. I may try that, but I think it has gone into the valve.

@jsr: yes Ive pumped it up to a 100psi and scraped at it with a nail and it leeks slowly.

I'll just give up on it, it was only a bv pneumatic made from scraps
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 26, 2007 2:45 am

I meant 300 psi+ with a shock pump ;)
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Unread postAuthor: benstern » Wed Sep 26, 2007 10:34 am

I would try to dremal it out.
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Unread postAuthor: Hubb » Wed Sep 26, 2007 11:11 am

We are talking about the simple little valve stems used to fill the pneumatic cannon, right? If that is the case, just replace the stem.
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Unread postAuthor: TurboSuper » Wed Sep 26, 2007 6:24 pm

I was reading the specs on some potting epoxy and it said that acetone destroyed it after ~40 days.

Worth a shot.
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Unread postAuthor: cdheller » Thu Sep 27, 2007 4:57 pm

I'm not sure if the valve stem you are having problems with is a schrader or not but,

Auto parts stores sell a 4 way combo tool designed to tighten or loosen the valve core ,, easy out broken cores,,tap the inside threads,, tap the outer threads ..

taking out the epoxied core , chasing the threads to clean up the epoxie ,and putting in a new core and being done with it would be my plan ,your mileage may vary
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Attachments
a0001932.jpg
* The 4 in 1 tool for valve stem and core.
* Rethreads inside and outside of valve stem.
* Insert, tighten or remove valve core with guide which slips over stem.
* Easy-Out to remove core if shoulders are broken off.
* All steel, plated to resist corrosion.
a0001932.jpg (5.06 KiB) Viewed 992 times
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