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)

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

Product ID: 593544130

Details

Brand
Refrigeration
Material
Nylon
Colour
Blue
Shape
Round
UPC
330051886132

✅OEM-approved for guaranteed system safety

🧴Lubricates O-rings & gaskets smoothly

🛠️Seals flares & threaded connections flawlessly

€ 45.89

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧊 Seal smart, leak less — the pro’s choice for flawless refrigeration!

TRUSTED BY OE MS - Backed by original equipment manufacturers for reliable, industry-standard performance.
COMPACT EFFICIENT - 30 ml pack designed for precision application without waste or mess.
FLAWLESS SEAL EVERY TIME - Ensures leak-proof connections on flares and threads, eliminating costly system failures.
ZERO CONTAMINATION FORMULA - Protects your refrigeration system integrity with a non-contaminating sealant.
SMOOTH ASSEMBLY LUBRICATION - Reduces friction on O-rings and gaskets for effortless installation and extended part life.

Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant is a 30 ml OEM-approved formula that seals flares and threaded connections while lubricating O-rings and gaskets. Designed to prevent contamination and ensure reliable, leak-proof refrigeration system assembly.

Specifications

ASIN	B008HOSQQQ
Best Sellers Rank	#57,564 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #336 in Hardware Sealers
Item model number	RT201B
Manufacturer	Refrigeration Technologies
Product Dimensions	2.54 x 2.54 x 1.27 cm; 22.68 g

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