Rust is not a problem here, unless it is stainless or poly it has a very short lifespan. For instance here is a pic of a 3/8 bolt i replaced yesterday with a stainless one. This used to be a new black oxide coated bolt just a little over a month ago. The rust here is just where i washed it off yesterday.
[Linked Image from electricalphotos.com]

The lesson is in the struggle, not the victory.