I ordered sideskirts for my car this summer. Finaly just took them out of the box today(yeah I take my time). Well there are some areas where it has deformed a bit from being in the box so long I guess. How can I straighten them?

 

lean them up against something in the opposite direction then the way they where...

 

is it eurothane? i used a heat gun on my lip that sagged over the winter storage