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Primer+Glue...or the notorious EPOXY?

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Primer+Glue...or the notorious EPOXY?

Unread postAuthor: OuchProgramme » Fri Jan 18, 2008 12:16 am

Working on my first BB/Airsoft gun, i want to create it perfectly. Because most of the gun will be constructed from PVC, i come here to ask whether epoxy or PVC primer+glue would work the best. Which would would be best for bonding down PVC to PVC-I'm sure its primer+glue, but prove me wrong otherwise-, and for bonding PVC to other materials (metal)


Thoughts? Suggestions?
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Unread postAuthor: th3p0p0 » Fri Jan 18, 2008 12:19 am

Primer+Glue. Thats why its called PVC glue :wink:
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Unread postAuthor: OuchProgramme » Fri Jan 18, 2008 12:24 am

th3p0p0 wrote:Primer+Glue. Thats why its called PVC glue :wink:



Well yes. As i've stated in my "description", but i still have doubts..ever since my last pneumatic exploded.
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 18, 2008 12:38 am

Roughening up the contact areas and using proper epoxy is just as effective, I use such construction techniques up to 400 psi without failure.
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Unread postAuthor: th3p0p0 » Fri Jan 18, 2008 12:42 am

why did it blow? did it have DWV on it or what?
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Unread postAuthor: MrCrowley » Fri Jan 18, 2008 1:05 am

Unless there was a crack or it was a bad fitting, it shouldn't of blown if it was pressure rated, used below the rating and the primer and glue were used properly.

For bonding metal + PVC, try using threaded adapters. :roll:

But yeah, best stick with PVC glue and primer, make sure the glue is meant for pressure and check with the PVC too.


Also browse the forum for a link to the IPEX solvent welding course, you should try it, so you know what you are doing when it comes to PVC solvent welding. You'll get a free pen and certificate too. :)
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Last edited by MrCrowley on Fri Jan 18, 2008 1:10 am, edited 2 times in total.
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Unread postAuthor: hi » Fri Jan 18, 2008 1:08 am

if you do it right it will not fail. i actually had a piston valve "blow up" because i was smart enough to not put a bumper in and the pipe itself failed, but the solvent weld joints were still intact.

if you apply it properly, it will not fail, but that is true of epoxy too. i recommend pvc cement and primer.
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Unread postAuthor: SpudBlaster15 » Fri Jan 18, 2008 1:15 am

As JSR said, a proper epoxy bond is very strong, and with such construction techniques, you would likely experience a failure in the pipe long before the epoxy joint.

PVC primer/cement joints will eventually reach the strength of the base material, but this may take a year or more, as joint strength development occurs with solvent evaporation, and it takes a very long time for all of the solvent to penetrate through the pipe and into the atmosphere. However, I believe most joints will develop more than 3/4 of their maximum strength after 24 hours.

Either way, you should be fine.
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 18, 2008 1:30 am

the notorious E-POXY?


sounds like a rap act :roll:
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Unread postAuthor: Carlman » Fri Jan 18, 2008 3:12 am

jackssmirkingrevenge wrote:
the notorious E-POXY?


sounds like a rap act :roll:


lol you never cease to amaze me jsr
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Unread postAuthor: Novacastrian » Fri Jan 18, 2008 3:21 am

Carlman wrote:
jackssmirkingrevenge wrote:
the notorious E-POXY?


sounds like a rap act :roll:


lol you never cease to amaze me jsr


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Unread postAuthor: Carlman » Fri Jan 18, 2008 4:33 am

im not THAT much of a grasshopper am I? lol
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Unread postAuthor: OuchProgramme » Fri Jan 18, 2008 7:21 pm

th3p0p0 wrote:why did it blow? did it have DWV on it or what?


Nope, it was 500 PSI rated PVC. The glue came loose on one of the joints while i was aiming.
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Unread postAuthor: MrCrowley » Fri Jan 18, 2008 7:56 pm

OuchProgramme wrote:The glue came loose on one of the joints


There's your problem :wink:

Try <A HREF="http://www.spudfiles.com/forums/solvent-welding-course-recommended-for-all-t3009.html">this</a> it's worth it.
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Unread postAuthor: bigbob12345 » Fri Jan 18, 2008 8:04 pm

You probably didnt let it dry long for 24 hours but if you did just read through the solvet welding thing Crowly has a link too.
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