I try to think of scratches, within reason, as patina. You know, part of the natural aging process of a useful object. No good violin, guitar, book, or bicycle should be without them. Perhaps we just have a philosophical disagreement about this....

Anyway, there certainly are places on my Strida where the patina is more pronounced than others. The left side of the steerer tube, the right side of the seat tube and crank tube, and both crank arms, are especially dinged up from being put on the steel luggage rack of the commuter train. In fact the wear on those places is so constant that I left them bare when I put reflective tape on the rest of the frame. There is also a groove on the steerer tube where a bolt on the bottom bracket hits it when I fold the bike up. That groove is so deep I have put a plastic zip tie there, which seems to be preventing further damage. I rather doubt your protective film would do much good against the latter, but if the stuff works as advertised it should do very nicely protecting the rest of the frame from the kind of wear mine has seen.

If you try it, let us know how it works!

Rudi