That's a great tip, Susan, about the cover sheet. I've wondered if they are different - top versus bottom, and have tried both and couldn't figure it out. But did realize that sometimes the sticky went away faster. Could be why! So I will label the new mats' covers I got before I even use them. Thanks!
I have a tip for cutting things with many layers - if you can swing it (afford it), have several mats. Then you can keep the various cuts on the mat, while cutting the next pieces without lifting them off the previous mat. Helps a lot when putting together those things with lots of little pieces. You just take them off the mats as you need them, and then you don't have to worry about orientation or *gasp* losing pieices (like losing Ariel's eyes or Jasmine's earrings - I've done both before getting several mats in the process.) So frustrating to put a character together to only realize later that you needed those little bits that you threw away!