Everybody has their preference. In the tint business, we go wet. I see where instaling a vinyl dry can work, but not with film. I only do large interior commercial buildings, and have been in the game for 16yrs. I would love to see anybody do it dry and still walk away with a profit. Vinyl maybe, poly film....not a chance unless you feel like poking hole all over the film to get the air bubbles out. Of course I am talking about large jobs, not singles.