A couple of weeks ago while walking to my car in the garage it appeared there were large water drops on the rear wing. When I tried to wipe them off I discovered it was dry but the rear wing had black film on it rather than paint. The dealer tried to squeegee the air bubble out to no avail. A new wing just arrived with only primer and will be painted next week all covered under warranty of course. The shop foreman said it seems to be an issue the factory is aware of as they sent the new wing with primer.

Everyone should check theirs while the car is under warranty, it's not an obvious defect unless you look hard.