Do it any time a small stone hits the windshield and leaves a small crack. Best to do it before the crack grows or it will be too late. As long as the crack doesnt block your vision. Take a small sharp bit on your drill and very slightly etch the center of impact (DONT GO THRU THE GLASS). Put a large dab of super glue on the damaged area and then use a plastic dry wall putty knife to spread the super glue smooth. One pass is all that is needed. Use Q-tips soaked in rubbing alchohol to remove all smeared super glue not on the damaged area off your windshield. Has worked for me 4 times with no spreading of cracks. Worst case is have the windshield replaced by insurance company. ( This is a Nothing ventured, nothing gained approch).
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