Hi Frank........
With pot metal, the only thing that seems to work is to sand blast, rinse with distilled water, then immediately plate in flash copper @110-120 degrees @.03 DCA per sq.inch.
look for a post in this section by 48Buick. This guy has written the "Bible" on pot metal plating as far as I'm concerned.
Once you get the copper to hold, it will be difficult to even sand blast it off!
Good luck, hope this helps!
MD
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