Review on OptiPolish GP15102: High Precision Grinding & Polishing Solution for Glass and Concrete Surfaces by Michael Robinson

I had a project where I cut glass bottles to make drinking glasses. I have used this product for fine grinding over 100 bottles and it still works quite well. Although a little pricey, it was worth it. I probably spent more than I was worth on other types of abrasives that didn't work twice as well or didn't last twice as long. I would definitely buy it again if I had another project.