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Originally Posted by y7turbo

Something I've never heard anyone say about Nylog is that it should be used WITH thread tape on NPT fittings. This is from the instructions on Nylogs website.

I use Nylog on flares and gaskets and a few other things like assembling txv's. For NPT fittings I use leak lock, it always seems to work just fine. Follow the instructions and allow it to set for a few minutes before assembly and I've never had an NPT fitting on a refrigeration system leak.

All of the "leak stoppers" have their ideal application like y7turbo said.
I carry and use at least 3:

1. Nylog for mating surfaces.
2. True Blue for pipe threads.
3. Leak lock for leaking glands,"pack them glands and pack em good boy".
4. lock tight for SAE/metric threads

Originally Posted by STSMech

Dont know which shell your working on (sherman?.) maybe new gasket/oring and proper torque and sequence? Only asking, never had to use a product on a shell cover. However I have seen Nylog on compressor head gaskets. I imagine that would work.

I'm talking about the threaded hole in the cover where you can install a access fitting. I have seen at least 20 shells with leaks around the access fitting that had Leak Lock on it.. I usually remove it, run a tap down the threads and install a new fitting with Leak Lock. Sometimes it seals and sometimes it doesn't.

Originally Posted by STSMech

Dont know which shell your working on (sherman?.) maybe new gasket/oring and proper torque and sequence? Only asking, never had to use a product on a shell cover. However I have seen Nylog on compressor head gaskets. I imagine that would work.

He was talking about the brass 1/4"SAE access port fitting that screws into the head of most large filter shells, not the shell seal itself. Even though I personally put a small film of nylog on the new cover o-ring gasket before I bolt the head back down.
I just have made it a personal habit to use it on any gasket, O-ring, any threaded item, valve caps, or whatever it may be that is trying to prevent refrigerant from sneaking out. Stuff is truly Nectar from the Gods.

Originally Posted by Lightning_Boy

Leak lock for schmoes, nylog for pros.
End of discussion

ohhh my god I need some nylog, I'm not a schmoe, nylog...nylog... better than slice bread, I'm running to the store ... must get some nylog... nylog ohhh my god nylog I'm not a schmoe

Something I've never heard anyone say about Nylog is that it should be used WITH thread tape on NPT fittings. This is from the instructions on Nylogs website.

I use Nylog on flares and gaskets and a few other things like assembling txv's. For NPT fittings I use leak lock, it always seems to work just fine. Follow the instructions and allow it to set for a few minutes before assembly and I've never had an NPT fitting on a refrigeration system leak.

Originally Posted by hands

Has anyone found a thread sealer for refrigerant fittings that is better than Leak Lock. Over the years I have found a lot of refrigerant filter shell covers that have leaks around the threads of the brass MPT connectors. I have always used Leak Lock on the threads in the past and sometimes it works and sometimes it doesn't.

Dont know which shell your working on (sherman?.) maybe new gasket/oring and proper torque and sequence? Only asking, never had to use a product on a shell cover. However I have seen Nylog on compressor head gaskets. I imagine that would work.

I finally found some Nylog and plan on using it soon. I got the HFC type even though I will be using it on a mineral oil system. I read that it is semi compatible with mineral oil. I don't plan on getting it inside the system anyways.

Leak lock for schmoes, nylog for pros.
End of discussion

Leak lock sucks

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i'd really like to start an organization that strictly opposes the use of leak lock. the resi/commercial install dept. at my employer uses it regularly on refrig/gas pipe fittings. its straight up garbage. it cures and hardens like concrete. you know how many unseated flares, plugged up metering devices and service ports that couldn't take a hose fitting i found this summer? too many to count. have fun cleaning it off afterwords.

nylog for refrigerant seals, mega lock or gripp for gas pipe/water threads. end of story. let us never discuss this again......

Originally Posted by B1978

I have used RectorSeal for the past year without a single issue. Think I may try nylog now.

Sounds like a personal problem to me! Or maybe something you need after a long weekend of partying....

I have used RectorSeal for the past year without a single issue. Think I may try nylog now.

Never used the nylog, never seen it, but will be getting some now. I have used the blue stuff, sparingly, over the years with success. What I hate about the stuff is the guys who apply it with a calking gun!! I cuss non stop when chiseling the stuff off.

For NPT fittings, 3 wraps of teflon tape, with a thin application of Loctite 567. The best way to go. Never had a leak doing it this way. Quit using Leak Lock years ago.

Can't stand Leak Lock! Got called to look at a walk in cooler that previous tech had covered the txv connections and orifce in the stuff, no room to do anything, took ages to clean it all of as it sets like stone.

Been using Tru-Blu by Rectorseal for years on taper threads without any problems, comes apart again if needed.

Originally Posted by hands

refrigerant filter shell covers that have leaks around the threads of the brass MPT connectors.

In this situation, it's hard to beat a combination of.

Teflon tape & loctite

Thank you jpsmith I was wondering about that but all the info I find I vague

I HATE LOC-TITE!!!....used it for ohhhh soooo many years, and if it gets hot or cold it will eventually leak. Works wonders on those hot discharge plugs and head sensor threads. Awesome on discharge/suction service valve cap threads, and on any gasket or O-Ring I install.

NYLOG is true nectar from the Gods. Will NEVER go back to LOC-TITE.

Originally Posted by Dchappa21

Nylog works well... But I like using loctite 567 on those drier core fittings...
Also works great on those old discharge gas thermostats on 06E compressors. Leak lock will never seal those.

X2
I carry tubes of both on my truck.

Nylog works well... But I like using loctite 567 on those drier core fittings...
Also works great on those old discharge gas thermostats on 06E compressors. Leak lock will never seal those.