disolving epoxy?
Posted: 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 
Thanks
Thanks
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Posted: Tue Sep 25, 2007 5:29 pm
hydrochloric acid (sold as muriatic acid) could probably do it. It might damage the valve stem.
Posted: 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.
Posted: 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.
...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.
Posted: Tue Sep 25, 2007 6:17 pm
Not to mention dangerous.boilingleadbath wrote:All of which will destroy your valve stem in one way or another, besides being difficult and/or expensive to acquire.
Posted: Tue Sep 25, 2007 11:03 pm
Have you tried pumping it to high pressure?
Posted: 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
@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
Posted: Wed Sep 26, 2007 2:45 am
I meant 300 psi+ with a shock pump 
Posted: Wed Sep 26, 2007 10:34 am
I would try to dremal it out.
Posted: 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.
Posted: 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.
Worth a shot.
Posted: 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
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