I personally use a wide tip Zig Two Way Glue pen to make my mats sticky again. I got the idea from My Pink Stamper - Robyn. But here is a link to Laurie's blog and she uses Aileen's Tack It Again mixed with water. http://www.hidinginmycraftroom.com/2010/08/making-cricut-mats-sticky-again.html
<^..^>Lori