Things You'll Need
Screwdriver or wrench
Aerosol spray paint
Auto supply stores carry a wide range of spray paints suitable for metal, including other metallic finishes.
If the fireplace is a wood- or coal-burning one that heats the doors up, use heat-resistant paint.
Read the label instructions carefully for both primer and paint. There are many types of spray paint and they all have different instructions, some quite specific. For instance, some spray paints must either be recoated within one hour or after 24 hours, or the finish will be ruined.
Whether your brass fireplace doors have become dingy and tarnished, or you're just ready for a change, painting them is a fairly simple weekend project. Your doors may be solid brass or brass-plated steel -- a magnet will not stick to solid brass -- but in either case the process is the same. Taking the doors off will probably be a longer task than doing the actual painting, and aerosol spray cans will make quick work of the painting.
Remove the doors and frame. Most fireplace doors are mounted on a metal bracket; you may need a wrench or screwdriver to remove the doors and frame from the bracket.
Disassemble the doors as much as possible. If they have black chain or mesh curtains, these will probably be attached to a single bracket to the frame.
Clean the fireplace doors well with acetone and a fine sanding sponge. This removes sooty buildup and oil; using the sanding sponge to clean the doors will scuff the surface at the same time so the paint will adhere well. Wipe the surfaces with a clean, dry rag.
Mask off what you can't remove, such as the glass fronts. Use masking tape and newspaper to precisely cover the glass on both sides.
Lay the fireplace doors on clean dropcloths or cardboard.
Spray the doors with metal aerosol primer. There are several types of primer; the paint and the primer you're using must be compatible. Apply several light coats instead of one or two heavy coats, until the brass finish is obscured.
Apply several coats of paint in the same way you applied the primer.
Apply a coat of clear protective sealant for a glossy, scratch-resistant finish. Not all spray paints require this step.
Reassemble and install the fireplace doors after they've dried for 24 hours.
Stevie Donald has been an online writer since 2004, producing articles for numerous websites and magazines. Her writing chops include three books on dog care and training, one of which won a prestigious national award in 2003. Donald has also been a painting contractor since 1979, painting interiors and exteriors.