I'm working on tidying up some of the stuff on my little EZ Loader trailer, and the fenders have some rust on them. What's the easiest way to get rid of it? I was hoping that I could just hit it with a wire brush or sander and then a couple coats of Rust-Oleum or something. But then I read somewhere that paint won't stick to galvanized metal? But then other places say that by the age this trailer is now, that won't be an issue?