There are a couple of multistep methods Firegirl, but they are a nuisance.
I read a 1930s method than ran to 13 layers and another , later one that ran 7 layers.
There is, or was, an AC aluminum-bronze rod that will deposit on freshly scraped aluminum and an AC phos-bronze rod that will lay down on that ,as well as steel. A little tricky but possible...pf
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