Originally Posted by
IAmCatOwned
If they are warped, they are useless. If you have a brand you don't like, offer it in a garage sale. All my quilting stuff with the exception of some thin fabrics, were snapped right up.
Heat renews warped cutting pads, some advocate laying on towels and books. As I mentioned before I just lay mine out on a hot sunny sidewalk. Has worked for me. Happy sewing.