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To be fair this product doesn't say it'll work on Apple watch screens, but another reviewer said it did, so i thought i'd try it - I can confirm it doesn't.
I'm really careful with my watch so when i managed to put a very fine scratch across the glass, i was a bit miffed and everytime i looked at the watch i could see it. So i had to try something.
After several applications following the instructions, all Polywatch seemed to do was highlight other tiny marks i hadn't noticed before, making it slightly worse overall. I think it might have made the main scratch less 'hard-edged', but it is still just as visible. Also, reading other forums (I wish I had read before) it is possible to remove the hydrophobic coating, which I hope I haven't done - I can't see any evidence of this, but I was concerned.
So, I have now purchased some JETech screen protectors, which I wish I had used when the watch was new. Not only are these almost invisible (you can feel the edge rather than see it) but they are very easy to install. Best of all, the protector has covered over the scratch making it hardly noticable unless you really look.
My advice, accept you have scratched the glass and there's nothing you can do about it apart from try to cover it with a protector and make it less noticable. The attached video is the watch with JETech protector fitted.
I have a vintage Sandoz watch from 1972, covered in scratches on the crystal and the case. I sorted the brushed case with some damp, fine sandpaper. The polywatch made some impression on the crystal, but to be honest, the thing that gave me the best results was Cif bathroom cleaner - and it is a lot cheaper!
I tried to use it on a Fitbit, and though it made the face of the watch very nice and shiny, it did little to remove the rather deeper scratches on the watch face - I thought it might have reduced them more than it did