Painting pot metal
Zinc chromate primer should do the job over pot metal if your final finish is paint.
Plating pot metal, while interesting to this forum, isn't the way to go if you are finishing with paint. It's the hardest material to plate we know of. It's no short cut over zinc chromate primer.
Sand blast the part thoroughly clean, then zinc chromate prime, then finish with a compatible top coat.
Ken
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