If you have a truly vintage glider and want to restore it, you must do so carefully. The first step in restoring a metal porch glider is to remove any rust. A spray with phosphoric acid should do the trick. A bristle brush can be used as well. For iron porch gliders, finish by applying a weather-resistant coating. For a wooden porch glider, it depends on the state of the wood. Some wood gliders could be too warped or rotten to fix. Other times you can strip the top layer of wood and reseal and refinish it. For more help, either seek a professional in antique restoration or Watch this Tutorial for Restoring Metal Porch Gliders.