You might try a product called Slipit which is sold by Grizzly under
catalogue# G5562 or G5563 http://www.grizzly.com/catalog/2004/249.cfm
am sure others sell it too.
Slipit is called a contact lubricant is is silicon free (no residue). G5562
is a spray and G5563 is called a compound gel. I purchased the gel at the
recommendation of one of Grizzly's sales reps. After you clean up your
table top you brush it on, then wipe it off with a clean rag. I apply it
3-4 times a year and it does a pretty good job. You can buy it for about
$10/quart and my first quart has lasted about 2-1/2 years and I've used
about 1/4 of the can.
My tools are in an unheated garage and I have very little rust. In addition
to protection they help your miter gage and fence slide too.