what i used was a sanding pad with some very aggresive paper(40 grit). i cut out the bad with a skill saw and feathered the bevel for the patch with the grinder/sander. i had a friends 8" grinder and i was doing more harm than good. i went back to my 6" and the sand paper and had better results. i got the paper at a flooring store. it is used on the edger for redoing oak floors. there are a lot better glass guys on here, they will know a lot more than me.
good luck
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