We had three metal yard chairs, got them free somewhere a few years ago. This weekend I steel-wooled them down and gave them a fresh coat of Rustoleum. Good as almost-new.
One of the chairs had a loose bolt. The nut wouldn’t turn because of rust and old paint, so I Dremeled it off. The blade shot little sparks that made me feel like a miniature ironmonger. I tightened the chair with a new nut/bolt combo.