Gentlemen, we seem to have convergence.

This has been an interesting thread - replies that said use zinc
anti-seize and another or 2 for anti-ox (e.g., Penetrox). Looking up
Penetrox, I find that it's zinc based! As is my bottle of Noalox. The
MSDS for Noalox shows that it's only 20% zinc, so I'd say zinc
anti-seize would be better, but still basically the same thing.

Thanks to all,
Bob