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Maybe the powdered aluminum works as a sacrificial anode. I dunno. Any qualified chemists want to comment (in layman's language, please - I skipped chem in HS...)?
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Dude, no, not the New Alunminum stuff. I'm talking about the
original stuff. I would not put aluminum stop leak in a copper based cooling system. I'm not that stupid. Use the orinigal stuff that comes in a tube in
powder form(G12BP). It's brown looking. Works well with copper based systems. They've been selling this stuff since the 1940s.