Seriously,
For rust removal on steel (besides gas tanks and radiators) I prefer
phosphoric acid. I've been stripping the new Morris project frame and
bodyshell of light surface rust and then wiping down with a phosphoric acid
primer/prep. NO rust remains to be trapped under the etch-primer and no
need to discuss the short-comings of POR15. The phosphoric acid converts
the surface rust back to iron and leaves the parts with a mottled
black/white finish that can be painted over with primer. Its nice to know
that there isn't a patch of rust sleeping under the paint waiting to bloom
in the spring.
Glen Byrns
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