Permatex Super "300" seems to be formulated for
exactly this type of application. (re-sealing plug caps)
From Permatex webstie:
Non-hardening sealant designed to resist heat transfer fluids such as oil or antifreeze.
Does anyone have experience with Super 300?
A few permatex products were mentioned earlier in this thread. (Specifically
Permatex #2 and
Permatex Indian Head)
What are the similaraties/differences between Super 300, #2, and Indian Head?
P.S. - Congrats to CitizenPete on what sounds like a resolved issue!
I am a few months behind . . soaking the plug caps in liquid wrench. Will attempt removal tomorrow!