I would like to add these comments so that those members searching the archives will be able to read this. STRESS CRACKS in windshields were never a big problem until the automotive industry changed their methods of holding the glass in the car from "rubber set", or what we used to call rubber gasket, and butyl tape kits, to urethane. The older style tape kits were nothing more than long pieces of sticky butyl either 5/16" or 3/8 depending on the car model. The windshield, upon installation, "sat" on this sticky black bead and both held it in and made the seal. Any chrome trim was strictly ornamental. Usually, a series of metal "clips" held it on. These butyl tape kits were very forgiving when it came to body flex, but unfortunately, were also very forgiving when it came to keeping the windshield in the car should there be a severe accident. And you know the result of that. So, the manufacturers went to a newer style of installing the windshield which was what is now referred to as "urethane set" and is the standard used on automobiles. A "bead" of black urethane that looks like black silicone is laid on the pinchweld, and the glass is laid on it wet. Small, usually plastic, supports hold the glass from slipping downward while the stuff dries. It normally takes about 24 hrs. for a full cure and that baby is IN there. Urethane dries very hard and, as a result, is less forgiving when it comes to body flex. Hence, more stress cracks now and then but a MUCH, much safer car, and a much more structurally sound and rigid body, since the windshield now affords additional strength where there used to be very little. ONE last thing if I may>>>an experienced glass installer can spot a stress crack right away, at least I could. Comes with experience like everything else. Working on these things every day, you get to know the cars that are famous for them and even where they will crack. The manufacturers are usually aware since we tell them and they are constantly trying to eliminate known areas that develop stress cracks.
Hope I didn't bore anybody to tears. Pete the ex glass guy