Yeah it does not stop all from seeing but it works to some extent they mostly use it for sign making, they print on it, I have been thinking of using it as well, apparently it is very easy to install not like solar film where you get bubbles, this stuff because of the holes doesn’t have that issue. You put it on a bit larger then the opening and press it down then cut it around the edges. I guess not allowing it to bend together would something you would have to watch for. I have never installed it but the guys at the sign shop said it was not difficult so I imagine the backing could be peeled away as you rub it on. I think it is a good idea for privacy, it would darken the inside and I wonder how long it lasts as it is usually applied to the outside.