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Epoxy on a Hole?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Epoxy on a Hole?

Unread postAuthor: Darkside 6ix » Tue Jun 03, 2008 12:50 pm

I am going to sell my old cannon to a friend of mine, but before Im selling it, I will be taking out the schrader valve and the pressure gauge. Im going to ask him If he plans on buying his own pressure gauge or if I should just seal up the hole. How should I seal it, with epoxy?
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Unread postAuthor: Carlman » Tue Jun 03, 2008 12:53 pm

if your friend has no clue about spudguns the safest way would be to leave it in, or put in a pop off valve instead
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Unread postAuthor: Darkside 6ix » Tue Jun 03, 2008 1:00 pm

Well he does know the ropes on pneumatics...But I was just wondering if epoxy will hold if brought up to pressure.
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Unread postAuthor: Davidvaini » Tue Jun 03, 2008 1:06 pm

what pressures are you currently running it at and what material is your cannon?


My guess is that it will hold, epoxy is pretty strong crap.
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Unread postAuthor: Gippeto » Tue Jun 03, 2008 1:52 pm

Either put a pipe plug in the hole or tell your friend to do it.

Epoxy is pretty strong stuff, but seriously, small pipe plugs are VERY cheap.

What do you think your friends eye is worth?
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Unread postAuthor: Hotwired » Tue Jun 03, 2008 2:05 pm

Gippeto wrote:What do you think your friends eye is worth?


About $7000 for the corneas.
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Unread postAuthor: Davidvaini » Tue Jun 03, 2008 2:35 pm

totally worth it :D
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Unread postAuthor: psycix » Tue Jun 03, 2008 2:39 pm

I suggest leaving the gauge in and buying a new one.
Screwing in and out will damage the pvc somewhat and may cause leaks if done too much.
Just let him pay a lil bit more for the cannon and you buy your own gauge.


@ hotwired
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Unread postAuthor: DYI » Tue Jun 03, 2008 7:32 pm

I've only managed to blast properly applied epoxy out of the hole it set in once, and that happened at the same time as the pipe from the "Copper Pipe Failure" thread got shredded by at least 10kpsi. On the other hand, the sparkplugs for my 20x oxy/propane hybrid are essentially 1/2" pipe nipples filled with epoxy with two wires through the middle. That's over 1.2kpsi, and they hold just fine (although if they aren't done properly, the plug inches out after a few shots).
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