I used it on my home windows, it was enough to do 3 windows 34" wide x 72" but because I had to cut it for the top window then another piece for the bottom window six times. The first piece turned out to be the worst and the sixth piece was the best lol. The first one I cut to match the window and because it was super hot outside the water on the window was drying before I could get the film separated, so I kept having to wet the window. The most difficult part was getting the film to separate and I wish I would've had a helper but I did it alone. The film when you are pulling the back off it will want to stick to itself and when that happens just use a water bottle with the soapy solution and spray it alot as you pull the back off or even in the area where it gets stuck on itself. I advice not cutting it to fit before hand but rather keep an extra inch on all sides and use an exacto knife and trim it after you get it flat on the window (I used a wide squeegee made for this purpose that I bought separately) By the time I got to the last window I figured out how to get the film off the back by using electrical tape lol (I am not one to read all the directions which suggests using tape) and I also began putting water on the back as I took the film off and then put it on the window vs pulling it off from under it while trying to put it on the window as I did the first time and found out real quick it was too difficult. Also the tape came in handy to hold the film on the corner of the window while I smooth it out.