rScotty
Super Member
- Joined
- Apr 21, 2001
- Messages
- 8,330
- Location
- Rural mountains - Colorado
- Tractor
- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
I took the technical route to fuel resistant sealers. From my motorcycle & boating days I had done a lot of experimening with sealing gas tanks suspended over hot engines.rScotty, since you brought it up, I purchased Permatex High Performance Thread Sealant for both the hydraulics and the fuel system (recommended by the Hydraulics place where I purchase my seals, fittings and hydraulic hoses).
The Permatex website states the following: "Stainless steel fittings, head bolts into through holes, oil PSI sending units/sensors, oil and coolant lines, intake manifold switches, rear axle fill plug, and fuel fittings."
What were your findings in regard to thread sealers impervious to gasoline?
Thank you,
The cured material has follow threads, stay flexible, and resist petroleum based fuels plus various alcohols forever. Silica thickened polyurethanes are one group that works. None of the RTVs or silicons I tried worked long term. Epoxies? I don't know.
My favorite "go to" goo for gas tap threads is the time-honored Hylomar Universal Blue - it's an aviation product, but you can probably find it. Get the old style type. which is a proven product, but does outgase when curing so is being replaced by a newer formulation. I've used the old formulation many times. Developed in Britain, maybe by the same engineers that designed machines that leaked so many fluids in the first place.
Let me know how that Permatex works. It would be nice to have an alternative to Hylomar Blue. There are three Permatex products that are similar to Hylomar and might even be better. I just don't have experience & would want to run a few basic experiments just to convince myself they are good.
So I'm still using Hylomar Universal Blue (old style)
The Permatex products I was considering - just based on chemistry - are:
Permatex 80017 Aviation Form a Gasket
Permatex 85420 Orange Permashield
Permatex 80057 300 Form a Gasket
rScotty