I want to share my experience of having my driver and passenger windows tinted.
The van was in my possession for only 15 hours. Windows clean, no scratches.
I took it to a local business. They made a template from the exterior side of the window and use the
glass as a cutting board for quick cuts on the film. When I left, the light
hit the scratch caused by the Olfa/Utility knife that was about 3" long.
I told the technician and he said it was there before, caused by a sticker that was there, etc.
He will not take ownership of the scratch. After talking with him extensively, he offered
to pay for the window to get buffed out. I don't think so. I also found an identical scratch
on the other window from their same technique. The scratch is deep enough to catch your fingernail.
Don't let this happen to you. Take pictures of your window beforehand and let them know not to cut on top of the glass.