Review on 🪨 Delphi Glass Stone Abrasive by Robert Lemons

I bought this hoping to use it as an edge guide for my stained glass projects. Although the description says it's for stained glass, it never evened out the edges of my glass. I even tried sharpening the glass for about 15 minutes and still nothing seemed to happen. I thought I might have used the wrong side, so I turned it over and tried that side, but still nothing.