"Separating the clear release liner from the overlaminate can be challenging. Try sticking a piece of 3M Scotch tape in the corner of the face and back of the overlaminate. Pull both pieces of tape away at the same time. This should allow you to separate the overlaminate from the liner so you can get things started."
Should You Overlaminate Window Perf?
"If you want optimal protection for fading and scuff resistance then you must use optically clear vinyl overlaminate. However, if you want the utmost visibility through the perforated window film, then you can't vinyl overlaminate. In this case an aerosol spray overlaminate could be used prior to install and make sure that liquid does not plug up the perforations. Please note that if you do NOT use vinyl overlaminate it is very difficult to see through the perforated window vinyl when driving in the rain.