i have 2 mat boards that are warped i tried to fix them by putting them in the sun, how do i fix them please i need help

I store mine flat with books on top of them.. and keep them away from heat.

http://www.quiltingboard.com/t-61595-1.htmd
This is what one member did.

I searched and found this article

http://www.generations-quilt-pattern...tting-mat.html

a dead link

Heat will warp your board. You should not iron on, leave in hot car, or in sun. I think I warped my 1st board along time ago and then kept it under some very heave objects to press it flat for a while. It is still usable.

Heat is the culprit and, probably, the fix. I found out that my desk lamp, one of those on a long adjustable arm, will warp my mat if I leave it on overnight!! In that case, turned off the lamp (duh!) and put a heavy pile of books on the mat. Fortunately, the mat unwarped after a couple of days. Good luck.