Better than my idea of using my heat gun. SWMBO's hair dryer would not scorch it or melt it in seconds like my heat gun.
I am going to do Captain's sun trick first. I had actually thought about that. If that does not work.... or we have no sun on Wednesday, then the hair dryer will be put in service.
I know it's a ridiculously small thing to be concerned about these days, but it is driving me crazy. It can curl up over an inch. I stubbed things on the edge moving them to the mat more than once, spilling things all over the place. I just need it to lay flat like nature intended.