Predicting when and why a small chip in your windshield will spread into a long crack is as hard as predicting the exact path of a bad storm. A good windshield repair technician can give you his best guess based on his/ her experience and the patterns they see but there are too many other factors involved for them to be right every time. Below are just a few things that can cause a chip to spread.
– Extremely quick change in the windshield’s temperature. ( For example: Turning defrost on high in the winter or turning the A/C on high in the summer)
– Slamming your car door
– Hitting a pothole or speed bump
– Moisture getting down in the crack