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!

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.

awesome thxxxx!

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.

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...

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.

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)

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

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.

where is pro dope available?

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!

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.

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.