Dust the chair with a feather duster. This ensures the paint will stick well to the wood surface.
Cover any edges near upholstery or other materials on the chair with painter's or masking tape.
Paint the wood surfaces of your chair with the base color. This is the color you want to show through the cracks in the finish. For instance, you can use a brown color that is near the color of the wood for the base color and a tan color as your secondary color. Brown cracks will develop in the paint to give it an aged look. Any color combination is fine; simply select colors that coordinate with the room the chair is in.
Allow the base color to dry thoroughly.
Apply a layer of school glue with a clean paintbrush. If you want wide cracks in the finish, use a thick layer of glue. For a crackle effect with fine lines, use a thinner coat of glue. Do not allow the layer of glue to dry. Apply the second color of paint directly onto the glue while it is sticky.
Allow the second coat of paint to dry thoroughly. You can see it cracking as the paint dries.
Paint a final coat of glue over the finish. This protects the antique effect and seals the finish. Allow it to dry completely before using the chair.