Thickness refers to the total thickness of the plastic pouch. So a 6-mil pouch has 3 mils of plastic above the paper and 3 mils below the paper, for a total of 6 mils of plastic. (One mil equals 1/1000 inch.)
A pressure-sensitive adhesive on the outside back of the pouch is protected with a white cover sheet. Laminate your sign, then peel off the protective cover sheet and stick the sign to any smooth, dry surface.
Our permanent adhesive can stick for years. Our removable adhesive holds well, but is easier to remove and reposition.