My Z is garaged nightly but I cover it every day while at work except when raining. And I have done it on every car I have owned since 1984. No problems with paint damage. Do a search under my posts for a review of the cover I bought for my 370 a couple of years ago. It rolls up to fit in a drawstring bag about 8" x 18" long if rolled tightly and I toss it in the washing machine about once a month. Keeping the sun off the car goes a long way towards protecting the paint and interior. Since I live in SouCal where it rarely rains, so between keeping it covered & garaged, and touching it up with a California Duster and some spray detailer and a microfiber towel to get off any bugs or water spots I only have to wash it about once a month.
One man's experience and one man's opinion offered entirely for what it's worth.
