If you have a Michaels or AC Moore or other craft type store, look for Sophisticated Finishes Rust Antiquing Set. It is a 2 part system the will rust anything. The first part is a Metallic surfacer, it is finely ground metal particles in a paint like solution, paint it on let it dry. The second part is the antiquing solution, you paint it on ,it is like a mild acid, and it turns the metal solution to rust. The stuff works great.