This may sound like a really dumb question, but it's one of those I've never really known the answer to and the sort of question everyone wants to know but is too embarassed to ask....and I was crap at physics and chemistry at school!
I've a few patches of rust appearing in the normal places - top of the rear wing just below the vinyl panel, fron wheel arch etc. It's nothing serious yet, but I've always wondered, does the rust continue to form and eat away under the surface even if you're parked in a nice dry garage. I mean does more water need to be introduced to continue the process, or does it just carry on once it's started even though it's in a dry environment. Mine doesn't appear to be getting any worse and I try not to get her wet anymore now i have a garage....