Phil,
Eureka!
I found the Penzoil anti rust formula!
It is simply called Penzoil Marine Corrosion protestant.
It comes in an aerosol, 12 oz. can.
It claims to prevent rust and corrosion, in a salt water environment for
2000 hours of continuous exposure.
This is the stuff I spayed into the back of the rockers in my seams,
outside of my seams, and into my front and rear suspension A frames, and
into every crevice I could find.
No rust started, anywhere I have applied it, even in this Ca-Ca, winter
we've had here in the Windy City.
I do not posses any hard data, or scientific formulas for it, just the
simple, plain  english fact, that it works for me.

Later,

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Terry 85 GL