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Yes, the homogeneous PVC......like a Medintech or Mipolam are going to relax and flatten out eventually unless the creases are really severe and/or you don't smooth them out when laying.....in other words don't compress the goods into the glue by not letting it relax and get all the air out. With heterogeneous stuff you get creases within and between the layers that gravity, manipulation like backrolling, heat and traffic can't fix.