What year is your coach? Basic answer is YES, it happens eventually on most if not all. Some folks say it is mold. Whatever, eventually (5 year or so) unless you rig is stored inside more than it is used ouside the film will be crazed/cracked and look terrible. The are other discussions on the forum about removing it, which many of us have done. IMHO, the vinyl mask (regardless of brand) is a waste of money that will cost you even more money unless you sell/trade within 3 years.