The various sized and shaped zinc anodes have to be changed yearly on a boat. In total each boat begins the year with approximately 50 lbs of zinc.
As an example I can purchase 1 lb zinc bars from Canada Metals at $1.00 lb,, the zinc once cast into an anode now is worth about $5.00 lb.
Zinc has a low melting point you could probably use RTV to make semi permanent moulds. Be a good sideline while scrap prices are down.
Zincs & Anodes | West Marine
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