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

🔧Seals flares & threaded connections flawlessly

🧴Lubricates O-rings & gaskets for smooth assembly

🛡️OEM-approved contamination-free formula

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Description

🛠️ Seal it like a pro, leak-free and worry-free!

INDUSTRY LEADER - Ranked #4 in Industrial Thread Sealants—join the pros who won’t settle
LEAK PROOF CONFIDENCE - Stops refrigerant leaks to protect your system and the environment
PRO GRADE RELIABILITY - Trusted by fleet mechanics and OEMs for consistent, high-quality sealing
EFFORTLESS APPLICATION - Smooth lubrication reduces wear and simplifies installation
CLEAN PROFESSIONAL FINISH - Easy cleanup for a neat, job-site worthy result every time

Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant is a 30 ml professional-grade sealant and assembly lubricant designed to prevent leaks in flares and threaded connections. OEM-approved and contamination-free, it lubricates O-rings and gaskets for smooth installation, making it a top choice for mechanics and HVAC professionals seeking reliable, clean, and durable sealing solutions.

Specifications

ASIN	B008HOSQQQ
Best Sellers Rank	#644 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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Excellent communication throughout the order process. Product is perfect.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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€ 39.80

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