Oh my, I thought I was particular about my zed but I don't even bat an eye lid about leaving it out in the elements.
I gave up worrying about stone chips, marks, rain, etc long ago, these are cars that are meant to be driven and enjoyed.
Reminds me of seeing lots of old classic, vintage cars all spotless and gleaming, wrapped up nice and warm in a museum, it's such a shame, those machines should be out there being used as they were intended.