Definitely have to follow the reviews and use soapy water for it to stick. I first taped it at the top and then cut off the excess and then unpeeled sprayed and pressed down I used a really large book to get out all the bubbles. ￼￼ at first it looked like something in a meat factory but after about a day and it dried it became a lot more opaque. ￼ for some reason the room looks brighter with it now and kno