I have a crack, about 3/4" long, in the windshield of my E320. It is, of course, smack dab in the middle of my field of view. It is not a "bulls-eye" conchoidal fracture, but a more or less straight line. An automotive glass place will charge me $35(CDN) to fill 80-90% of it with their pressurized glue, but will not guarantee me that the pressure will not spread the crack. It would be worth $35 to get rid of the annoying thing, but not if it wrecked the whole windshield. Does anyone have experience with this technique? How often does it spread the crack?