I realize this is an old thread, but we have had some recent issues with the IJ35c-20. like they forgot the air release part. full coverage ink, mounted to ACM, it's been bubbling after mounting. not cool. looks like bad work, but it's fine until like an hour later. Wattzup with 3m? We complained, and they are sending a new roll. My say is, this has happened with vinyl from two separate rolls. I don't think my boss was aware of that when he complained. Not just one roll, separate rolls. two bad rolls ordered weeks apart.