I also am a member of that "oh no" class this week. Went to a sew-in and left my cutting mat in my car, on edge behind the driver's seat. I was there about 3 hours and didn't take it out of the car because there were mats provided. Well....I am sick. My cutting mat...24x36 is now warped. Any ideas for restoring. Ironing? or leaving it in the sun lying flat? or? Help. Any ideas appreciated.