I would contact Therm O Web (800-323-0799). I had an issue once with Wonder Under and called Pellon & their Customer Service was super helpful. I just left a voicemail & the lady called me back less than 24 hours later with all sorts of helpful ideas that saved my quilt top. It turned out that one of my fabrics apparently wasn't 100% cotton, but she managed to help me make it work anyways.
