"Carl Ijames" wrote in
:

Don't know about the paint but I'm a real believer in "Evapo-Rust" for
getting rid of rust. Harbor Freight and I think Autozone carry it.
Best if you can dip the parts in - just leave overnight without
stirring or an hour or so with agitation. They say you can soak a
towel, place it on a flat surface, and cover with plastic sheet to cut
evaporation. Rewet the towel and shift it around every hour or so.
Haven't tried it yet but when I get around to painting my trailer I
will. Should work on your tank.

I'll second that. It's very good stuff.

Doug White