Originally Posted by mary j
is there a way to flatten a warped mat?
You can put it out in the hot sun in the summer on a flat surface. Also if it is small, put in in the oven at 140 f. for about s5 min or so it warm thru, then put it on a perfectly flat surface to cool. I ruined mine in the car. Of course if all else fails, put a sheet of plywood in the car (in the sun) put the boeard on top and let it get hot and then cool down overnight. It should be flat. A couple of weights help.