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powdered magnesium will burn bright and hot, real hard to put out, I'm not sure about cast magnesium Maybe someone more knowledgable will kick in on that. As far as powder coating magnesium I probally wouldn't due to a bad expereince with powder coating aluminum parts



Aluminum can show worming when powder coated, looks like pock marks & usually it shows up on parts that had minor visable problems before coating but looks alot worse after the coating process...

Magnesium probably would do the same thing being a non-ferous metal..