For film itself. If you've read the other reviews, you're already prepared for the difficulties with the dust particles. I have a table wiped wet, so set the display to a foam lobe (of pressure) that I could lean against the keyboard edge a pile of books. This gave me the necessary freedom of movement to hang the film in peace according to instructions. A small speck of dust has still slipped, it is in the border area and would also certainly be subsequently removed, but it does not bother.
Neither the color nor the contrast have deteriorated recognizable. For me it is a very large value. I would advise anyone who is struggling with a reflective display is recommended to invest the low cost and the small amount of work.