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The reason many covers allow water through is to prevent water from sitting on the car while it's covered. It lets any water that might be on the car evaporate, preventing it from just sitting there and causing problems.
Personally, I'd just let the car sit outside naked. I've done that with my cabrio and my Z4 with no issues. I'm more worried about the damage the cover can do - unless the car is perfectly clean and dry, the cover could scrape various particles against the pain and scratch it up. And after a while (I did used to cover one car long ago) it gets to be a real pain in the butt to make sure that the car (and cover) are perfectly clean and dry.
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