So with all due modesty, I consider myself after many years laboratory experience with very sensitive special equipment and tiny amounts of sample for proficient with sensitive equipment and materials. I have also successfully dismantled several mobile phones, replace defective parts and reassembled without instructions of course but with the necessary tools. But the application of this film succeed - the Nokia Asha 300 - only with the greatest difficulty. The film is so nearly cut (at least my copy) that there are only a few tenths millimeters game within which the film can be applied. In addition, it is so hard and thick that the smallest speck of dust lead to large, raised air space around the Staubkörnches or -härchens. By the adhesive coating, the particles can be subsequently highest with a special pair of tweezers and remove even close to the edge again. I find this film to be difficult to apply, that goes almost entirely under laboratory conditions and hardly satisfying for a layman. On the second try, it is reasonably successful, but that was my last purchase of a Mumbi film.
