Thoroughly clean your magnesium die—most soaps or detergents can be safely used on the die. Be sure all chemicals are removed from the die. Then carefully coat the die with a light oil—a nonstick cooking spray works. Once the die is completely dry, tightly wrap the magnesium plate or die in plastic wrap or a resealable bag. The priority is to remove or reduce oxygen from the die, as oxygen contains moisture which will start the oxidizing process.
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