For applying, clean the screen with a Microfastertuch and then attach such beschriebendie film. The best to use disposable gloves. If it does dust should be under the film, this best with a Scotch Magic Tape (that leaves no residue when easy peeling of the film) Raise, another piece of tape on the screen or the slide, depending on where the dust now sits and everything reattachment.
Sounds a bit complicated, but is simple in reality.
Now the films cost at another supplier 4.99 + 0.99 shipping. I got delivered this today in Market Place at Ecultor for 2.99 + shipping 1.