Remove the seat cushion with a screwdriver.
Brush away any rust spots with a wire brush. Pour several quarts of warm water into a bucket and mix in a squirt of liquid dish soap. Clean the chair with the warm soapy water and a rag. Allow it to dry completely.
Cover the entire chair with a coat of rust-preventing spray primer. Allow it to dry for 30 minutes.
Spray the entire chair with a thin coat of rust-preventing spray paint. Allow the paint to dry for five minutes and then spray on another coat. Wait five more minutes and add a third coat.
Place the chair in the garden as an accent. If desired, hang a plant from the back or train vines to grow over the chair.