First, i thought, how in the world this can ever do any good when you have warp. I am old school and is faithfulness to what i think it works. Glad i tried it, I love it. WOW what a product. IT it super safe for all uses, even microwave. You can do refrigeration and freezing. So easy to put on in all size or dishes. It keeps food fresh and I think it is better than the wrap I have. Love it and really need to get on the tread more!!!