The attachment of the foil is not possible for everyone. I consider myself not too awkward, finally, I have already provided some phones with screen protector. Due to the size it is, however, almost impossible to attach the film without bubbles. Finally, all it takes is a smallest Staubflankerl to create a huge bubble acting. As 2 films were enclosed, I'll try it with the second still steamy bath atmosphere, maybe that's better. Subjectively, the film slows down a little bit, but I have already experienced much worse at other manufacturers.