Description:   Repair and renovate your firearm using the Birchwood Casey® 3 oz. Aluminum Black Metal Finish, which restores scratched and marred areas for a like-new look. This fast-acting liquid applies quickly with no dimensional change, and the color will vary depending on the alloy. Also great for blackening name plates, plaques, trophies and more. Birchwood Casey 3 oz Aluminum Black Metal Finish - Gun Cleaning at Academy Sports.