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Title: Heat Destroys this product otherwise GREAT tool
Review: I received 2 mats, the 18x24 and the 24x36. These are great surfaces to work on and have great visual aids for cutting stuff on. I took the big one to the art show to mat some prints. The work table wasn't really in direct sunlight4 weeks ago and the high was 83. So I noticed the matte curling up like a clam shell. The thing won't lie flat and is ruined. So I took the smaller one to our beach house last week. it was transported in a tub with the other kits. when I got there this too was curled up even worse than the later one. I do not remember seeing warning labels about heat. Now these 2 precision tools are nearly useless. They were really pretty expensive.
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