What Polywatch (or any other similar product) does is to use a super-fine grit to create enough friction to allow a tiny amount of plastic to melt into the scratches and fill them in.
Sometimes you will notice that the crystal will look better 24-48 hours after treatment, than immediately after application. That's because you've given the fresh melted plastic a chance to harden.
Usually I use masking tape around the bezel and edges to protect them. This is very important for gold-plated or filled watches as the chemicals tend to get underneath the plating and react with the base metal of the case.
Hope this helps,
gatorcpa
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