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DORM ROOM GUITAR (my first custom guitar!)
i am a sheet metal worker by trade. Absolutely do bit use galvanized or coated metal. Get uncoated steel, remove the oil and other contaminants from the factory, generally by heating and/or scrubbing with a solvent and then heating to remove solvent, then use high heat special purpose barbecue paint like Pitt Bull paint, if you want to prevent corrosion.
I am a sheet metal worker by trade. Absolutely do not use galvanized metal or metal with coatings.