Gas Key Sealant

[prepare]

There seems to be no industry standard gas key sealant. The TM manual I have does not say either.
http://pdf.textfiles.com/manuals/MIL...4%20manual.pdf

[bamashooter]

Other than info stating to fire a few to let carbon act as a sealant, this is the only one I've ever seen to reference Permatex.

[prepare]

Thanks!

[bamashooter]

You bet.

[hotrodder636]

SOTAR has a couple of YT videos that talk about it. I think he uses some sort of shellack.

Check out his video here:
https://youtu.be/GCFAtcV1c8k

[rjacobs]

as with other things in life... I go in dry...

[utahjeepr]

I believe you would be more likely to create a problem than solve one using a sealant. A thin shellac would be better than a thicker gasket sealant though.

Since using nothing works, I'll stick with that.

ETA: I don't have my notes with me from Will's class. I'm in Prescott, AZ this week. I seem to recall him saying machine tolerance should be enough. I can update when I get home. Assuming I remember, before I head to Denver Monday night. Attending his armorers class (which I considered very good instruction) is as close as I come to being an honest mechanic. I generally go with the title "shadetree gun butcher" just to keep myself honest.

[tehpwnag3]

I've sealed and not sealed and never had a problem either way. If I was to build a BC today, I would not use sealant.

[markm]

I haven't done a key install in years. But I lap the surface and was using some rockset on a few. I think someone said rockset was not a good idea, but I never had any leakage issues.

[prepare]

I reached out to BCM, Sionics, Toolcraft, and Aim Surplus. They all report using Permatex Aviation Form A Gasket.
I then contacted Permatex. Permatex Aviation Form A Gasket 80017 and 80019 are the same product. 80017 is 16oz. and 80019 is 4oz. The 3D was an old numbering system that is no longer used.