John,
I've had good results from some stuff called
"Rust Reformer"
by Rust-oleum. Other people make similar compounds. It supposedly converts
rust to some other non-oxidizing compound, and prevents further rusting. You
paint it onto rusty spots and it turns them black, acting sort of like a
primer. Where I've used it I haven't had repeat rust after several years. A
friend of mine tried it on a spot he wanted to look nice, and he had a devil
of a time sanding it smooth afterwards. It seems the stuff dries really
hard. I wouldn't recommend it for body rot, but it works well on surface
rust.
Jim Harroun
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