There is a product called BOESHIELD T-9 which actually does, reportedly, work for this. It was suggested in some thread years ago and I got a can, it appears to work well enough keeping rust creep off my ancient drill press table.
Great to see Boeshield in this thread - so much of what's happening in this thread is the wrong product for a particular application. As you point out, Boeshield is a great product for protecting cast iron
Boeshield has a tendency to increase friction though unless buffed really hard.
Lanolin based coatings (fluid film, et al) don't have this issue.
Of course, i live in a super-humid place these days, so i have to control humidity anyway. This doesn't stop rust, but it means i can worry a lot less about which coatings and how often.
