The other night I went to the grocery store and when I came back my mat was warped! How the heck that happened I don't know. It is always laying flat, never rolled.
I'm thinking the cold air from the window did it? I tried to lay heavy books on it, ironing it and using my heat gun, but no luck flattening it out.
It is old however, bought it in 1999.
Is there any way to flatten it?
Thanks!