What do you put underneath the film to make it move smoothly?

Answer 1: Baby powder

Answer 2: Dryer sheet

Answer 3: Liquid fabric softener

Answer 4: When you see videos with film moving very smoothly during the application process, the tinter is usually using very high-quality film. High-quality film moves much more smoothly. You should also look for film that shrinks well. 

Answer 5: For a smooth install, try using a squeegee to get all the excess water off after cleaning the glass. Then, wipe it try and go over the glass with a dryer sheet.