You were right to put the

The best thing you could do is to drill out the holes in your part to ensure there is no corrosion left, then fill them using a Solder Paste - http://www.caswellplating.com/solderit.htm
Then plate the part with our Pot Metal Primer - http://www.caswellplating.com/alzinc.htm
You can then copper, nickel and chrome as normal.
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