Hi James,
    Permatex 3h aviation sealer will work well for this application. It has
been used  for years for the case split seam and head nuts on the air cooled
engines. In a pinch I have used it on wasser boxers with no problems. The
yellow stuff seems to remain softer and more flexible over time and many
heat cycles. Most any flaps will have 3h. It comes in a small can with a
brush for application.
    Good luck with your quest.

Darrell Boehler
Makanda Illinois

----- Original Message -----
From: James Ruch <jpeterruch@HOTMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, December 01, 1999 7:15 AM
Subject: head nut sealer

> Hi All
>
> Sorry 'bout beating an old subject to death but I'm beginning to tug at my
> hair here (not quite pulling it out yet).
>
> I've about given up on getting some "yellow head nut sealer" and I've not
> been able to find an alternative (ie: permatex super grey).  Everything
I've
> looked at/been pointed toward has been some type of thread treatment.
>
> Can someone please tell me what the purpose of the yellow stuff is?  I
can't
> imagine that it will prevent coolant leakage... is it supposed to prevent
> electolytic phenomena or what.
>
> I'm thinking about reassembling without it... or coming up with my own
> alternative solution.  My reassembly has been held-up for three weeks
> because of this (Grrrr)!  Thanks.
>
> J.Peter
> '85 Weekender "Snugvagon"
> Alfred, NY
>
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