A strong film, cumbersome attachment

Have bought the double-foil pack for my newly acquired D5200. Due to the good Rez ...
After fine säuberlichem Preparing, I have applied the film slowly and carefully - Mist thick bubbles despite caution (thick fingers ?!). Well then, back. Sch ... film gets a crease. Cursing I remove the first film and throw it away ... With rumblings I think of the 3 discarded Euros.
In the second film it works. I rely on the descriptions, pranks with a microfibre cloth as much as possible off the remaining air bubbles. It still looks as if it were just rubbish. After a day, the air bubbles are gone. Okay, great. That I wanted.
Real shortcoming is that the film "greasy film" forms at any contact. Sounds a bit crass, but is clearly visible - for me annoying.

All in all, okay, could be better. max. 3 stars