Just heat it up first
Read reviews of this elsewhere before buying. It comes tightly curled and not very pliable and some people apparently couldn't get past that. But others found solutions. One review I read said soften it in boiling water and then dry it flat. Another said blow dryer, but that it took forever. I just threw mine into a tub of hot (from the tap, not boiling) water for just a few minutes and then it was quite easy to lay it flat and weigh it down until it dried/cooled. After that no worries.
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