I have been sewing for years and I should have known better but recently I was pressing some seams and my self healing cutting mat was under my pressing board. I saw the corner sticking out and quickly lifted the board but 'dang it' - the thing had waves already from the steam of the iron. I tried hand smoothing but no luck. I haven't had it but about 8 months and had to wait for a special sale at JoAnns and got 60% off of a big one. Is there any way to get it to flatten back out???