I found out on a blog somewhere information from Olfa regarding mats
TIPS FROM OLFA
To clean and hydrate a mat:
Fill up a tub (or sink) big enough to submerge your mat. You need to do a gallon of water to 1/4 cup of vinegar ratio. Make sure the water is cool. Once you have enough liquid, submerge your mat and wipe off any residue. Use Dove or Ivory dish soap and work into a lather over your mat. Rinse off. Self healing mats love moisture and the more supple they are, the kinder they will be to your rotary blade. Wipe your mat off with a towel.
To straighten out a warped mat:
What you need:
A warm day
A warped mat
Concrete
Piece of clean, flat plywood at least as big as your mat
Piece of heavy glass as big at least as big as your mat
Lay your flat plywood on the concrete. Put the warped olfs mat on top. Cover with the glass. Leave outside in the heat all day. When night falls or the next day comes while it is still cooler, remove your mat and you will be left with a mat that is “reset” to flat.
Using a rotary cutter :
To save your hands: every Olfa cutter has a little set of ridges to indicate the best ergonomic position for your hands. Put your finger (I use my index finger) or thumb on those ridges to help decrease any joint pain.