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Beeswax is widely available, safe for accidental consumption, and will protect surfaces from the corrosive effects of atmospheric moisture and salt. Although bees are not harmed in the production, many vegans avoid it. People with allergies to pollen should avoid it.

Carnauba wax is a vegetable wax made from palm trees. It is hypoallergenic, and responsible for the shiny coating of a number of candies and similar edible products.

For either wax, rub it into the clean metal with a lint-free cloth until the surface is completely covered and slick. Use a small pick to reopen the pouring holes from the bottom up. Expect warm weather to cause salt granules to stick to the wax and occlude the holes.