Under a cover with blowing wind you could end up with spots where the paint was literally rubbed off. My gt's previous owner had a cover on it. I can tell via the 4 spots of the bumbers where the paint is missing. Its way too windy on Maui ...... consider your climate before using one.
My car sits in the driveway with dark tint and a windshield thingy blocking out the sun. My vipertruck is in the garage. (hows that for blasphemy!) LOL
patrick