Nylog - anybody use it?

MarkB_MI · Nov 29, 2020

On the topic of thread sealants, I've seen mentions of this product but I've never used it myself. Nylog is a thread and gasket sealant intended for refrigeration systems. Supposed to work great on flare fittings.
Nylog

Donaldinky · Nov 29, 2020

I like leak loc. It dry in lack of oxygen. never had a leak with it. It used mostly for refrigeration.

Hobo,NC · Nov 29, 2020

My luck with it is mixed... Its tacky and can cause an o-ring to roll out on ya while installing it. In that case alignment of the tube was in a hard place so being off could have been more of the issue. I had a O-ring/fitting on a new radiator leak at the transmission line at the radiator it stopped the leak I keep the car a few days to insure a fix it it stopped the major leak but a small leak came back.

Replacing the radiator was cheaper than having it come back to replace the transmission... Use caution it may come back to haunt ya...

SVcummins · Nov 29, 2020

If you need anything to seal a flared fitting you are doing it wrong

kencombs · Nov 30, 2020

I've used it on a couple of mini-split installs. No leaks. Don't know it it helped, but sure didn't hurt.

I did notice that the fittings screw together much easier with it on the threads.

DR. EVIL · Nov 30, 2020

I worked for a company that built INDUSTRIAL sized ice cream manufacturing freezers, used ammonia gas as a refridgerant. Our smallest freezer made right at 100 gallons of finished ice cream an hour, 400 liters, biggest made over 400 gallons an hour, and we built every size in 1, 2, and 3 barrel versions, so biggest model made 1200 gallons an hour if you had enough refridgeration compressor. I forget which brand exactly we used of Teflon pipe thread sealant, If our supplier ran out of the specific brand I had to call around to find that specific brand. The ammonia would dry the thread sealant out to a powder and it would leak. People don't like ammonia gas leaks in their factories.

For ANY kind of stamped paper or composite gasket I use HYLOMAR UNIVERSAL BLUE gasket sealant. It beats every kind of Permatex Aviation Form-a-gasket, or any other brand. It works on cork gaskets too but I absolutely HATE cork gaskets.

MarkB_MI · Nov 30, 2020

> I've used it on a couple of mini-split installs. No leaks. Don't know it it helped, but sure didn't hurt.

> I did notice that the fittings screw together much easier with it on the threads.

Yes, I found out about Nylog AFTER I did my mini-split installation. Per the Mitsubishi installation instructions, I lubed all the flare fittings with refrigeration oil, but the biggest fittings (1/2 inch flare) took a ridiculous amount of torque to get tight. The system still works about eight years later, so I don't think it has any big leaks. Still, if I had it to do over again I'd use Nylog.

MarkB_MI · Nov 30, 2020

> If you need anything to seal a flared fitting you are doing it wrong

Hmm. If flare fittings are so easy to seal, why do so many HVAC installers cut them off and silver solder the lines?

SVcummins · Dec 1, 2020

Never had one that wouldn’t seal as long as the flares match other . Pipe thread fittings ok but a flare doesn’t seal and isn’t designed to seal that way

Nylog - anybody use it?

MarkB_MI

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Donaldinky

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Hobo,NC

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SVcummins

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kencombs

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DR. EVIL

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MarkB_MI

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MarkB_MI

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SVcummins

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