Glass refinishing/buffing

A friend of mine borrowed my welder last fall and ruined his windshield with spatter. So he asked me how to fix it. I said buff. He didnt want to buy the stuff for glass. He borrowed my buffing supplies for paint. It worked great for him. Saved his window. I would have never thought of using regular buffing compounds.
I still havent tried it myself but I did see the results with his; and was impressed.