I used a product called "Extend" that was available at 
Home Depot.  I'm really not sure what it does exactly, but
it seems to turn surface rust into a very durable finish.
I had some surface rust on the bottom of my tower legs and 
applied this stuff.  There are no signs of any further rusting, 
after about 5 years so far.  My tower base is in concrete, but 
was not properly "domed," so dirt and water collect at the base.
I worried about the legs rusting out, but I don't see any
further signs since applying the Extend.  There may be other
similar products under a differet name.
-Kirk  K4RO
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