I have the same heat gun, just bought it to replace another one. I use it to shape plexiglas. I've msde waterfalls and under gravel filters gor fish tanks, domed lenses for shop lights, a lighted console for my truck.
They really aren’t designed to get this hot. That isn’t an expensive heat gun (Harbor Freight) but note how much thicker it is then a regular hair dryer. Also, it get VERY hot after a bit.
Just search youtube. The key is to heat the glass evenly at the same time, otherwise it will likely crack. Also the temperature is much higher so you need professional gear.
Janis Rough - it might be difficult unless you have the glass as a pattern. I would imagine you could bend a sheet of plexiglass the same width as the window directly on the window and then trace the borders. I just don't know if it would adhere to the glass at all. I suspect not, but it would be a disaster if it did.
