What putty do you use to fix leaky mags?

Jimski · July 22nd, 2009, 17:20

Which putty would you use to fix a leaky magazine?

mine leaks around the bottom plate and some bottom pins, so I figured it needed putty.
I tried PC7 and Marine goo but none is tough enough.
what would be?

thanks!

ujiro · July 22nd, 2009, 17:22

I always use like plumbers epoxy. 2 parts, you mix them together in equal portions, and then you've got a half hour or so to work with it. Its a bit messy, but it is real tough stuff.

I have used it to fix leaky mags before. Well, to do the mod to the MK23 mags. But they held the pressure just fine after.

Jimski · July 22nd, 2009, 17:33

awesome thxxxx!

coach · July 22nd, 2009, 19:12

cdn_stalker recommended the Blue Gasket Maker from CT. I actually just picked up a tube about 20 minutes ago. I have used teflon tape under the main seal on some mags and they don't leak anymore, others leaked slightly but significantly less than originally.

RockinShaun · July 22nd, 2009, 20:20

hey coach instead of teflon tape you can try pro dope. teflon tape is mainly for plumbing and can fail from the pressure and temp of the gas. Pro dope is mainly used in gas fitting applied on threads and joints to prevent leaks. The exterior dries while the inside remains plyable its available at home depot rona lowes ect...

coach · July 22nd, 2009, 21:56

never used pro dope before.

teflon tape is working fine on one of my mk23 mags and duckmans p99 mag. I put a couple of rounds under the main seal and the same over it. This works just fine for main seals that are visually intact and not stretched out of shape.

Teflon tape didn't hold the seal on Duckman's mk23 mags or the cougar because the seals are stretched out of shape and required too much tape to close the gap. I just did the Blue gasket maker on 4 mags and put a short burst of propane in them and they are holding well. I'll wait until tomorrow for them to cure before fully pressurizing them.

The other possible method that seems to work is to wrap a couple rounds of thread under the seal. This works for a couple reasons. 1) it closes the gap that the main seal needs to make, 2) it holds onto silly oil which will constantly feed the seal with oil preventing it from drying up. Now I haven't tried it but have read it from a couple different sources.

Deadpool · July 22nd, 2009, 22:04

For KJW mags you need to replace the original rubber seal with a new, thicker seal for the bottom plate. Or do what I did and shim the seal with a cardboard gasket (about 1/16 inch thick)

lemegacool · July 22nd, 2009, 22:28

i use teflon tape on the main seal and stopped all my kjw leaks

Jimski · July 22nd, 2009, 22:40

ok but teflon tape is for threading, not for flat exterior surfaces

coach · July 22nd, 2009, 22:50

Quote:

Originally Posted by Jimski

ok but teflon tape is for threading, not for flat exterior surfaces

nope. teflon works if you wrap it under and over the main seal. and it's not an exterior surface.

ybrik · July 22nd, 2009, 23:44

where is pro dope available?

CDN_Stalker · July 23rd, 2009, 10:22

Quote:

Originally Posted by coachster

cdn_stalker recommended the Blue Gasket Maker from CT. I actually just picked up a tube about 20 minutes ago. I have used teflon tape under the main seal on some mags and they don't leak anymore, others leaked slightly but significantly less than originally.

The automotive gasket maker gel from CT is foolproof and works every time for fixing leaks around that bottom gasket. Just make sure to let it cure for 24hrs before putting gas in the mag. I've fixed a couple dozen leaks in mags with this stuff, has worked every time.

For a tube that costs $5, the number of mags you can fix.................. geez, at least a hundred if needed!

coach · July 23rd, 2009, 11:16

I put a 1/2 second fill of gas in a little while after sealing them up. I needed to be sure that I had a proper seal all around. I had a couple really wonky main seals that deformed to about 4-6mm larger than they were suppose to be when coated with a little 25 weight silly oil. They eventually shrunk back to original size.

I'll be sure to vent them before test firing them in the gun.

Conscript · July 23rd, 2009, 11:21

stillbad · July 23rd, 2009, 11:52

Awesome bunch of tips here!
Been re-doing a bottom seal with plumbers(teflon) tape over and over, the re-building of which seems to be wearing on the parts more than actual use in the gun...going to try out that CT gasket maker gel in there 'cause i think it might be a bit far gone for the teflon solution.
Also, on a crack in the same mag(i suspect it developed while i was repeatedly popping the pins that hold the bottom of the mag on and off to re-seal), I just had success after being reminded about the existence of J-B weld.

Pays to know your magical goos says I.

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July 22nd, 2009, 17:20	#1
Jimski Trader rating Join Date: Jun 2005 Location: Montreal	What putty do you use to fix leaky mags? Which putty would you use to fix a leaky magazine? mine leaks around the bottom plate and some bottom pins, so I figured it needed putty. I tried PC7 and Marine goo but none is tough enough. what would be? thanks! __________________

July 22nd, 2009, 17:22	#2
ujiro Trader rating Join Date: Aug 2006 Location: Burlington, ON	I always use like plumbers epoxy. 2 parts, you mix them together in equal portions, and then you've got a half hour or so to work with it. Its a bit messy, but it is real tough stuff. I have used it to fix leaky mags before. Well, to do the mod to the MK23 mags. But they held the pressure just fine after. __________________ I love freedom and consequently America

July 22nd, 2009, 17:33	#3
Jimski Trader rating Join Date: Jun 2005 Location: Montreal	awesome thxxxx! __________________

July 22nd, 2009, 19:12	#4
coach aka coachster Trader rating Join Date: Mar 2008 Location: T dot	cdn_stalker recommended the Blue Gasket Maker from CT. I actually just picked up a tube about 20 minutes ago. I have used teflon tape under the main seal on some mags and they don't leak anymore, others leaked slightly but significantly less than originally.

July 22nd, 2009, 20:20	#5
RockinShaun Trader rating Join Date: Feb 2009 Location: Mississauga	hey coach instead of teflon tape you can try pro dope. teflon tape is mainly for plumbing and can fail from the pressure and temp of the gas. Pro dope is mainly used in gas fitting applied on threads and joints to prevent leaks. The exterior dries while the inside remains plyable its available at home depot rona lowes ect...

July 22nd, 2009, 21:56	#6
coach aka coachster Trader rating Join Date: Mar 2008 Location: T dot	never used pro dope before. teflon tape is working fine on one of my mk23 mags and duckmans p99 mag. I put a couple of rounds under the main seal and the same over it. This works just fine for main seals that are visually intact and not stretched out of shape. Teflon tape didn't hold the seal on Duckman's mk23 mags or the cougar because the seals are stretched out of shape and required too much tape to close the gap. I just did the Blue gasket maker on 4 mags and put a short burst of propane in them and they are holding well. I'll wait until tomorrow for them to cure before fully pressurizing them. The other possible method that seems to work is to wrap a couple rounds of thread under the seal. This works for a couple reasons. 1) it closes the gap that the main seal needs to make, 2) it holds onto silly oil which will constantly feed the seal with oil preventing it from drying up. Now I haven't tried it but have read it from a couple different sources.

July 22nd, 2009, 22:28	#8
lemegacool Trader rating Join Date: Aug 2008 Location: notre dame des prairies /quebec	i use teflon tape on the main seal and stopped all my kjw leaks __________________ member of fire team NOM. my other regular forum: www.toyotanation.com / gen3,gen4 camry

July 22nd, 2009, 22:40	#9
Jimski Trader rating Join Date: Jun 2005 Location: Montreal	ok but teflon tape is for threading, not for flat exterior surfaces __________________

July 22nd, 2009, 23:44	#11
ybrik Trader rating Join Date: Jun 2007 Location: Ontario, Canada	where is pro dope available? __________________ 5.56x45mm + m27 = M249(SAW)

July 23rd, 2009, 11:16	#13
coach aka coachster Trader rating Join Date: Mar 2008 Location: T dot	I put a 1/2 second fill of gas in a little while after sealing them up. I needed to be sure that I had a proper seal all around. I had a couple really wonky main seals that deformed to about 4-6mm larger than they were suppose to be when coated with a little 25 weight silly oil. They eventually shrunk back to original size. I'll be sure to vent them before test firing them in the gun.

July 23rd, 2009, 11:21	#14
Conscript AKaholic Trader rating Join Date: Jan 2005 Location: GTA

July 23rd, 2009, 11:52	#15
stillbad Trader rating Join Date: Mar 2009 Location: downtown toronto	Awesome bunch of tips here! Been re-doing a bottom seal with plumbers(teflon) tape over and over, the re-building of which seems to be wearing on the parts more than actual use in the gun...going to try out that CT gasket maker gel in there 'cause i think it might be a bit far gone for the teflon solution. Also, on a crack in the same mag(i suspect it developed while i was repeatedly popping the pins that hold the bottom of the mag on and off to re-seal), I just had success after being reminded about the existence of J-B weld. Pays to know your magical goos says I.

What putty do you use to fix leaky mags?

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