Originally Posted by rattlertrikes
I started in the auto glass business back in 1962 and we didn't have roto tools. We cut down all our curved windshields with a sandblaster. It is much easier than what is proposed here, and the finished edge is smoother, and the risk of breakage is much less.
Not that I doubt you, but I would think the heat from the friction of the high power sand would crack it? I have read about that method though, I read mixed results. I went this route because the startup cost of sandblasting equipment, taping off my own booth, etc was way more than the @$200 I spent with the rotozip and bit.