What should you use as a layer between the film and glass when you shrink?

Answer 1: Dryer sheets.

Answer 2: Baby powder.

Answer 3: Put some liquid dish soap on a paper towel, and then spray the paper towel with water. Next, run it on the windshield and let it dry. 

Answer 4: Using a layer between the film and glass might not even be necessary if you clean the window and lay the film out properly. 

Answer 5: You can avoid this issue entirely if you wet shrink.