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My Corsa suffered some minor roof damage from the hailstorm. The hailstones were a maximum of about 2 cm in size. Cars parked next to my Corsa (Citroen C3, Hyundai Ceed and similar) didn't get dented. That's why I think the sheet metal on the roof is too tinny. Have you experienced a hailstorm?
Google translated to German, sorry :)