Yesterday I was preparing some 1/4" BB for scrolling. It had a nice clean surface and I mad sure that it was free of any small debris. I placed the shelf liner on and burnished it with a roller. I noticed one of the corners was lifting. I burnished it down again. I mounted the pattern with spray adhesive. I began cutting and in places the pattern along with the shelf liner would lift on the blade's up stroke. I'm always VERY careful to put the liner and pattern down with HEAVY pressure on the roller. My shelf liner is not old but it is getting to the end of the roll. Perhaps it was old stock in the store but this is the first time it has happened. In the coldest weather my shop never gets below 50 degrees. I'm puzzled.