Good Thread Sealant

[Ducman82]

i have a bypass filter and gauge fittings that always seam to seap oil. i use Permetex liquid Teflon, but i always seam to get a little seap, and i dont want to tighten fittings to hard and risk cracking the oil pump houseing etc... . what do you guys use?

 

[DavidC]

NO. 2 non hardening Permatex works for me. I know it has been around before dirt and maybe that is because it works.



Dave

 

[rbattelle]

I'm cursed with leaks at fittings. Here's a thread where we discussed it.



Permatex No. 2 works for everyone on Earth except me. For oil and fuel fittings these days I tend to end up with a layer of Teflon tape coated with some Block.



Ryan

 

[Turbo1Ton]

I've used Loctite 545 for a lot of stuff (it is a thread sealer, not a thread locker). I used it on my Frantz bypass install and I haven't had any problems with leaks.

Jeff

 

[rbattelle]

I've used Loctite 545 for a lot of stuff (it is a thread sealer, not a thread locker).

One thing I've yet to try is Loctite (the locker). My understanding is it also functions as an effective sealant (although obviously you must let it cure before applying pressure).



Ryan

 

[nickleinonen]

i have used loctite [blue & red] as a thread sealer, but i really don't like it [can take threads off 1/8" brass if you do need to remove it later]. . i've had such good luck with pipe dope so i just use it

 

[steved]

I've used No2, BlueBlock, and PST...



Any paste with teflon seems to "melt" out of the fitting, causing leaks... I went through the same thing with my bypass.



I currently used teflon tape with good results.

 

[Little Bill]

The yellow Teflon tape specified for gas service (natural, propane, etc) is the one most suitable for diesel and other light oils. It is the highest density Teflon thread tape available. The white tape is high expanded Teflon and has a micro-porous structure. It's the same as the Goretex linings in apparel, let's water molecules pass as vapor but blocks droplets. White tape on thread joints depends on all the tape being completely crushed during tightening, which collapses the micro-structure. Areas that are not fully collapsed can wick fuel molecules. The yellow tape has very low expansion and is not dependent on total collapse to form a total seal. The yellow tape is a little more difficult to work with as it is not as elastic as the white due to the higher density.

 

[MoparDave]

I use Loctite 518 simply because thats what i have on hand

 

[CRuth]

Loctite 592. Just make sure to mix it first, it tends to separate.

 

[rweis]

I use Rector Seal #5 I get at Home Depot. A non hardening seal semi liquid that is rated for distillates. Never had a problem with it and it is rated for just about anything and everything. Make sure you get some of the "good stuff" at the bottom of the can in the thread paint. It is stickeyer and a little thicker than the less thick stuff that slightly seperates during storage.



Bob Weis

 

[GOlsen]

We use Loctite 569 Thread Sealant at work. Specifically designed for use on hydraulic systems.

 

[Kvic]

Thread sealant

I use Blue Magic, it is safe for most things, including diesel fuel, kerosene, and all oils. I use it daily as I am a plumbing contractor. But beware if you look at the can cross-eyed, you will end up wearing it. :-laf

 

[Ncostello]

Forget the Permatex with Teflon. Its worthless. I like Loctite with Teflone. Its much thicker.



The best available for anything is the stuff OEM's use for fittings. Its pre-applied and dries for use whenever you need the part on the assy line. Some is orange, some is blue.



Loctite 2020 is one type that dries. When you assemble, the molecues are crushed and it releases an agent that seals. But its not available to consumers. You'd have to buy 1000 gallons or something like that. I've tried and tried to get the stuff.