Clean the entire bed frame using soap, water and a cloth. Pay particular attention to detailed areas, corners and joints. Let the metal bed dry completely.
Sand the surface of the metal using fine grade sandpaper. Don't try to take the existing finish off, but rather create a rough surface for the new coat of paint to adhere to. Wipe off any flakes and dust with an old cloth.
Prop the metal pieces upright and apply a coat of metal spray paint. Use long, even strokes to prevent drips. Work on one side of the metal bed at a time. Let the pieces dry completely, about 24 hours.
Turn the metal bed pieces around and spray paint the other side. Touch up any areas you missed on the first side at this time. Allow them to dry completely.
Dip the sponge in the commercial antiquing patina. Apply the patina to the painted metal bed pieces, paying particular attention to any decorative elements, small spaces and corners. Lightly wipe off the patina stain with a cloth, leaving some places where the stain has streaked and gathered. Allow it to dry completely, about 24 hours.
Apply the clear coat spray to the metal pieces and allow it to dry completely, about 24 hours. Carry the pieces to the bedroom and reassemble.