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The pic in the next to last post showing the medium gray stuff is diy zinc plating. Here are my thoughts.
Metal prep is huge perfectly clean and no rust is needed.
Polishing is needed to get a shine.
Unpolished is a perfect base to paint over.
A commercial home kit will likely give better results if shininess is your goal.
Ther are plating forums that could help you get it perfected.
Zinc plating acts as a sacrificial material keeping the other metal from rusting even after parts of the plating wear away. Nickel only protects as long as the plating completely covers the item. Once it wears the metal item is sacrificial to the nickel.
John

Axle is almost ready.

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Axle is done.

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I have started on front disk brakes. This Paul's method from Craigs 56 Packard Panther site.
The parts list is back on the 1st page.

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