Polythene like skin is peeling off - Maintenance/Repairs - Car

I’ve Hyundai Sonata 2011 and I’m 2nd owner of this car. I’m living in Saudi Arabia, here mostly we’ve hot weather but couple of weeks ago it rained a lot and after rain, I noticed a Polythene like skin is peeling off from the trunk and from the roof. I’ve no idea what’s this, perhaps the previous owner wrapped it for color safety? Take a look at the attached picture.

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