There are a few common sense tips people can follow to ensure their windshield performs as intended. The ideal scenario calls for saving the original windshield installed by the factory. The conditions inside the factory for installing a windshield are perfect, so the confidence level in the factory seal between windshield and vehicle is highest. If the original windshield is damaged, there are two choices. Either repair the original windshield, or replace it. The advantage of repair is the factory’s safety seal is not broken. The windshield is not removed from the car. That saves both the very expensive windshield and the safety seal.

Many people are unsure if their windshield can or cannot be repaired, so it is extremely important to consult a competent auto glass service provider for advice.  If the damage is beyond repair, then windshield replacement is the only other alternative.

Source:carjunction.com