I used to install rollups by leaving the bottom two inches of the liner on, like a large amount of tinters do. Then I was shown this technique by another tinter. At first I thought "how can this work" ? But I tried it and have been using it ever since. So, before You bash, try it for Yourself. You may be surprised,
Wet the door panel a little....
Lay Bounty paper towels across the length of the door panel, leaving them about 1/2 inch from the window, and wet the paper towels real good. Don't be skurred to wet the towels good, because the towels also keep solution from dripping on the door to much. You can't use cheap paper towels, because they will leave lint fibers on the film.
Then clean Your windows and install film as normal. Peel the liner all the way off the film and wet real well.
Notice how the edges of the film are curled in and under. This in itself keeps a majority of the film off the panel.
Then lift the film off the panel with one finger as normal, and roll up the window. Hose the glass and the film down real well, and squeegee the bottom out as usual.
You will be very surprised with the end result. Holla! Remember if You dont give the customer a reason to complain....they won't.