"@amcananey, its mild steel of course its going to oxidize with moisture, they paint cars for that very reason. "
That's great...as long as you know that it is "mild steel". And how exactly am I supposed to know that? I wouldn't know steel from any other metal. I know the chassis is aluminum, and I know aluminum doesn't rust. Beyond that I don't have a clue.
Sorry man, didn't mean for that to sound condescending. What i meant to say is any bare untreated metal is going to oxidize, even aluminium, just some do it faster than others.