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Also, what is the best sandpaper for glass?
Sand down the edges with 150-grit, 220-grit, 320-grit, then finally 400-grit sandpaper to make your glass even smoother. Then, use 1000-grit and 2000-grit sandpaper to polish the edge to perfection. Wipe the edge of the glass with a clean damp cloth once you've finished sanding to wipe away any leftover grit or dust.
Just so, can you use sandpaper on windshield?
yes, sandpaper can destroy a windshield in short order! So can a razor blade if used carelessly, use with care a razor blade can remove most over-spray safetly.
An abrasive stone cannot shape your glass pieces the way a glass grinder can, but it can get rid of those nasty little edges on your freshly cut pieces of glass. Instead of taking your glass to the grinder to clean your edges, just run the surface of the stone against the area of your glass that needs smoothing.