If it's potmetal, you don't want to strip in chemicals potmetal reacts badly with acids. Because of the "bubbles" there will be pits in the potmetal that you will have to fill with solder (if they are deep and black, you may have to drill the black out). Clean, sandblast, rinse and strike nickle immediatly. Then acid copper and fill the pits with solder sand buff and plate as normal. Potmetal is a nightmare, especially if it's really old. As far as alum, I don't know of any stripping method that doesn't attack the base metal other than blasting. I may be wrong on this one, if there is a way I would like to know it too. I'm tired of sanding and buffing the blast profile off. Good luck.
Darrin
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