To finish bottle glass: Wear dust mask—don’t breathe glass dust! Placing aluminum tape on inside/outside of rim helps uniformity. Using a Dremel tool carbide conical grinding tip, rough up the sharp cut, and inside and outside of the edges. Continue using drum sanding attachments: 80, 120 then150 grit. If it’s still too rough, sand by hand using 200+ grit. Use a wire wheel on the lip for a shiny silver edge.