This is really for the gun that goes with these refills. I got it for my birthday in February. I had trouble with the gun rolling easy and not getting stuck. After talking with another user that had one I contacted the company cause something just didn't seem right. Sure enough Scotch had a bad batch go out. So they sent me a brand new one and a shipping lable to send the old one back. My new gun is much better! rolls easily and haven't got a blister from this one.
UPDATE: Having more problems with the new one. Contacted 3M and the lady was so nice. She is sending me another one. She explained what happened and why there were a couple bad batches around the time I bought mine and got the 2nd one. She said if the gun doesn't run smooth then it is defective and to contact them. Going to give it another shot!