Remove any rust that may have formed on your wrought iron with sandpaper. Use an up-and-down motion.
Rinse off the wrought iron with your garden hose. Allow the object to dry completely.
Spray the wrought iron with rust converter. If you aren't already wearing your gloves, put them on before working with the rust converter.
Spread the rust converter with a paint brush to make sure it is even. Allow to dry.
Apply primer to your wrought iron. Allow to dry. You can usually find metal primer alongside the regular paint primer at your local hardware store.
Paint your wrought iron--and your object will look like new.