Over half of the sheets we've used so far won't stick together when run through the laminator. We merely pitched the unused ones and switched to a different brand. Just call it a lesson learned.
I am laminating some items that are 2 or three layers of cardstock. I have to put the laminating sheets thru 2 3 or 4 times to get it to stick. Sometimes it never seals all the way in the middle. I have not had this problem with other brands. I won't buy this brand again. It worked fine with one sheet of paper.