[The Fixer]

I used to cover one of my Montes before I had a garage for it. After one winter with some heavy snow and ice, the little bit of rust that was on the body got much worse, since the cover trapped the moisture and accelerated the rusting process. IMO, if you have to leave a car outside, just put a few coats of wax on it and let it be. Road salt is the real killer for a car's finish, so if it's not being driven more than around the block a few times a month, no need to worry about it.

Again, it's just my opinion, but I'd hate to see the cover damage your paint.