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Old 10-17-2018, 05:57 AM
Mich48041 Mich48041 is offline
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,855

The Permatex Form-a-Gasket, that I used on black pipe natural gas fittings in my house, is soluble in rubbing alcohol. After tightening the joints, I thinned some Permatex with alcohol, then painted exposed pipe threads to keep them from rusting. The point is that Permatex might not be resistant to alcohol in fuel.
Joe Gores
RV-12 Flying
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Old 10-17-2018, 08:21 AM
dwranda dwranda is offline
Join Date: Jan 2015
Location: Jamestown,NY
Posts: 478

I suppose this question is pertinent to this thread. I am mounting my engine soon to work on the cowl. Looks like the oil pressure sensor fitting needs to be installed first. Is Loctite 567 OK for that fitting to the back of the engine? For those who have done this how tight does it need to be?
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Old 10-18-2018, 02:50 PM
rongawer rongawer is offline
Join Date: Dec 2007
Location: Brentwood, CA
Posts: 440

Like others, I've used Permatex #2 for many years on many, many threaded connections with no leaks. I have also used Permatex Thread Sealant with PTFE and it works great; for NPT fittings this product makes for a very good seal, yet allows for easier removal if ever needed and it does not harden.

One note about AN tapered fittings - use a couple drops of assembly oil (air tool oil works well too) wiped on the face and threads will allow you to fully assemble by hand while reducing galling potential. And then, once tight by hand, tighten one more 1/4 turn with a wrench and you're done - regardless of the fitting size and no torque wrench required.
Ron Gawer

- RV10, Build in progress.
- RV12, N975G, "The Commuter"
- Several others that are now just great memories for me.
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Old 10-18-2018, 03:40 PM
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snopercod snopercod is offline
Join Date: Aug 2016
Location: Asheville, NC
Posts: 1,747

I used the generic Loc-Tite stuff from the hydraulic hose store on all my pipe fittings - mostly hydraulic fittings for my landing gear. It was called "Pneumatic and Hydraulic Sealant". I figured if it was good enough for Caterpillar tractors, it was good enough for my airplane.
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Old 10-18-2018, 03:46 PM
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snopercod snopercod is offline
Join Date: Aug 2016
Location: Asheville, NC
Posts: 1,747

Originally Posted by az_gila View Post
... soft aluminum seals and should be able to repair marred surfaces on the 37 degree angle faces.
I carry some of those "Del fittings" in my "parts bag" on a long cross-country. I'm not sure why, but it seemed like a good idea.
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