I've used several covers on my Spitfire when I use to store it at home, I started with a Halfords one, that lasted about 1 month, I then progressed onto a Monsoon, which did the job, but again only lasted about 3 months before the wind got hold of it and ripped the securing ties off, it did not mark the car, but then again I did not pull it off that often as the car was stored and not used.
In the end I went for a Carcoon, works very well but not really for a daily driver, as they are zipped together plus you need a power supply and you can't use one in the street. That last 4 years but that rotted in the end, so I've now got my little girl nicely tucked up in an air-conditioned storage facility covered with one of the Sahara covers. :thumbup:
I think you biggest problem is if your car is a daily driver it's getting into a routine of covering the car, if it's wet then it's a no no, so I think I would be looking at washing it off during the week and if not used over the weekend then I would consider covering it, to be honest my RCZ sits outside and will do for as long as I own it, I just keep an eye on the bird crap and clean it off as soon as I see it, if you have a good wax on her it will help.
Here's what a Carcoon looks like in the fully blown up position :lol: :lol: - they do a fantastic job, they even dry the car if put away wet, the down side is they will cost you a good £700 to buy :wtf: :wave:
Just my little experience of covers - please don't use a Tarpaulin :eusa-whistle:
Rob.