Reply by CharlesA

I can’t compare to salt-air Florida, so take this with a grain of salt, but I have found Boeshield T-9 very effective at keeping the rust of cast iron. One of the mags did a test about 4 years ago, and T-9 was the most effective. Worth a shot.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson