I use Penetrol on a lot of tools/metal that is subject to rust. I know it is advertised as an additive to paint which I have done but I also have just apply directly. I painted a metal trailer with a metal paint and after drying applied a coat of Penetrol and no rust on it after several years. Once it drys it is very durable and and stands up to heavy use and rust does not attack it. Keep a can around for nuts/bolts that are subject to rust and it works great in preventing rust.
