Completely clean the piece to remove dirt and grime. If you're painting a chair or other upholstered piece, remove the fabric section to avoid getting paint on it.
Remove any old paint using a scraper and sandpaper. If the piece is stained, use sandpaper to rough up the surface in preparation for the paint.
Paint the furniture using your base color. This color will appear in the cracks. Allow the paint to dry completely.
Apply the crackle medium, a clear, paintlike substance, following the manufacturer's instructions. Allow the crackle medium to dry to the touch.
Paint the piece with the other paint color. This will be the dominant color of your piece. As the paint dries, the cracks will appear.
Add a clear coat after the paint has dried. This will protect your furniture and prevent the top coat of paint from flaking off.