Originally Posted by
dakotamaid
If you have a warped mat lay it out on a hot side walk for a while. Works like a charm.
I put mine on the driveway in direct Texas sunshine--103 degrees worth--with glass over it to enhance the heat and at the end of a 12 hour exposure it was still warped. Maybe the driveway was warped. It was worth a try, though. I sold it at a quilt guild garage sale for $2 and the buyer loves it! C'est la vie! froggyintexas