Bubble-free not install possible - Go quickly broken

Installation:
The protective film lies not install without bubbles from the 1st try.
At the outer edges of 2-3 bubbles could be seen.

The bubbles out polish was unfortunately not successful.
After each renewed attempt more and more bubbles are trapped.

Dust settles with repeated attempts to fast on both sides of the surface.
When the surface to cleaning attempt, the film then broke.

Maybe it worked with other users attaching the foil. For me it did not work out and the film broke.

In itself, the surface quality, however, seems to be in order.
A long-term test with respect to how fast the film was not contaminated possible.

Since it is a low-priced product, I asked no return request but disposed of the film.