Loctite 37482 545 Pneumatic/Hydraulic Thread Sealant Bottle - 36 ml

I used this item to seal a steel transmission line fitting to an aluminum radiator. Worked as advertised. I little pricey, but well worth the purchase.

I used this Loctite 545 on all the fittings in my methanol fuel line setup for my project, and it has been absolutely flawless. Not a single leak anywhere. It applies clean, seals perfectly, and holds strong even under vibration and pressure. This product gave me total confidence in my fuel system, and I definitely won’t stop using it. If you’re working with methanol or high-performance setups, this sealant is a must-have. Highly recommended!

Throw away all the rolls of teflon tape you have and just use this stuff. Yes it is not cheap but you are not slathering it on like spackle on your walls, you only use a tiny amount per fitting and the results are worth it, the bottle will last you years.

Worked great on my hydraulic line connections

This is an incredible alternative to teflon tape. There are times that the tape is too wide for some threads, and the liquid threat helps tremendously. I did try to use this for a shower head, it did not work. It's not advertised for use with low viscosity liquid(hydraulic fluid is more viscous vs water) but it was worth the attempt. You're also supposed to use yellow teflon tape for gas applications, which is not widely known. Regardless, this is a great product and I recommend.

37615 is the paste / 545 is the liquid for sealing threads Reviewed in the United States on September 18, 2026 Size: 19 Grams Had been chasing air system leaks on my garage system. I purchased this as well as Loctite 37615 to seal the treaded connections, I gave them overnight to cure before pressuring the system and no leaks(my pneumatic system remained at the same pressure 115psi for days with the compressor being switched off). The is a paste and has more body/weight to it compared to the 545 so the 545 is great for deeper threads where it’s difficult to get paste applied. The liquid thread sealer works excellently when applied to clean(or new) threads and allowed to cure before put into service. I appreciate it’s ease of use but as a liquid you should have a rag to wipe up any excess as it seems to get everywhere if you’re not careful.

This has been my go-to thread sealer on air hoses for many years now. Easy to apply, no mess, covers the threads well. Lasts a long time. Don't over do it and give it plenty of time to cure. I usually wait a day or two. It's not the best if you are in a hurry. So maybe do your Teflon tape for the job, then when done go back and put this on instead. It definitely works better if you let it cure.

Works excellent as it has for 50 years.

Tried everything to stop a leaking Fel controller with no lasting effect and was forever replacing O rings. Although pricey I decided to try this Loctite for Hydraulics and it has solved my issues! I am very pleased with this product and highly recommend it.

Después de darle servicio a mi compresor, no encontraba la manera de que no tuviera fugas de aire. Intente con tanto Teflon como pude, incluso sus variantes industriales pero nada conseguía sellarlo. Probé con este producto, no teniendo muchas expectativas realmente y mi sorpresa fue que ahora no tengo ninguna fuga. Es importante mencionar que si se debe de dejar secar al menos lo que indica el producto (24 horas) aun que por el clima frío lo deje una semana. Lo recomiendo TOTALMENTE.

Buen producto

As it is real Loctite it does work very well as one would expect given the cost. As the old adage says, "You get what you pay for."

This was recomended by some repair personnel and it worked great for my connections that were leaking using another product. However, this has to sit for 24 hrs to be 100% effective.