Wipe down the item with a damp rag and a dot of all purpose cleaner. Allow it to air dry.
Rub the item with 100-grit sandpaper, followed by 220-grit sandpaper. This will prepare the item for the spray paint. Run a handheld vacuum cleaner over the item, sucking up the dust from sanding.
Purchase several silver-based metallic spray paints in either a shiny or matte color that bears the name "nickel." Spray paint a piece of scrap wood or metal with each shade to test which spray paint gives you a color closest to nickel. It helps to have a nickel-plated object to compare the colors with.
Spray paint the item with your selected color. Move the can of spray paint evenly back and forth to create an even, uniform finish. Allow this coat to dry for 12 hours before applying a second coat to get a nice, realistic-looking finish.