I bought Polywatch to use on my scratched up bodybugg digital display that I wear as a watch.  Its face is raised up and I have scratched it up.  It was annoying to look down at this expensive thing and see scratches.  I used a small amount and polished with a cotton make-up square.  Not bad!  The deep ones are not gone, but they are a lot less noticeable.  It is much improved.  One day when I have more time I will do some more intensive work on it, as suggested by other reviewers, and see if the deeper ones will go away.