When doing a ductless AC system do you put this on the inside and outside of the flair or only on the threads?

This stuff is great. You don't put it on the thread, it goes on the flair. It's not like lock tite it's a flair tight. I'm a diu girl and this is great stuff. I used it a year ago and I still have great ac. Before using it I could not hold a vacuum on my system.

Will this work with propane gas lines

Having not used it, can't say 100%. But since R290 is purified propane, and this says it's for all refrigerants, I don't see why not. Though there may be additives in propane meant for heating that could possibly interact with it. Certainly propane for heating is not as pure as the refrigeration stuff. As someone else mentioned, asking the manufacturer is probably a good idea before trying.

can this be used to seal service valve caps?

I don't believe I would use it for that purpose. If it gets into the valve it would probably keep the valve from working properly. I generally use brass caps with o-rings to seal service valve ports.

Would NYLOG blue seal a slow rim leak in a tubeless tire?

I would think so.....but an expensive way to seal a tire....cleaning the rim bead with a wire wheel should do it.

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Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant, 30 ml (1 Pack)

Product ID: 3907127

Details

Brand
Refrigeration
Color
Blue
Shape
Round
UPC
330051886132
Manufacturer
Refrigeration

✅OEM-approved for guaranteed system compatibility

🧴30 ml precision applicator for controlled use

🛠️Seals flares & threaded connections flawlessly

₪87

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Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal smart, work sharp — the pro’s choice for flawless refrigeration!

PRECISION APPLICATION - Compact 30 ml size ensures no waste, just perfect coverage
MULTI FUNCTION MASTERY - Seals, lubricates, and protects O-rings and gaskets in one go
TOP RANKED PERFORMANCE - Ranked #2 in Industrial Thread Sealants—join the pros who trust it
INDUSTRY TRUSTED FORMULA - OEM manufacturer approved for professional-grade reliability
CONTAMINATION FREE CONFIDENCE - Won't compromise your refrigeration system's integrity

Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant is a 30 ml high-performance sealant and assembly lubricant designed to seal flares and threaded connections without contaminating refrigeration systems. Approved by OEM manufacturers, it lubricates O-rings and gaskets to ensure durable, leak-free performance. Compact and trusted, it ranks #2 in industrial thread sealants, making it a must-have for professionals seeking reliable, precision sealing solutions.

Specifications

ASIN	B008HOSQQQ
Best Sellers Rank	#432 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Industrial Thread Sealants
Date First Available	July 5, 2012
Is Discontinued By Manufacturer	No
Item Weight	0.8 ounces
Item model number	RT201B
Manufacturer	Refrigeration Technologies
Product Dimensions	1 x 1 x 0.5 inches

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₪87