The first step in repairing a windshield is to assess the damage. Types of windshield damage fall into two basic categories: chips and cracks. Cracks are normally the expansion of a previous chip but can also be caused by stress between the glass and the frame of your vehicle. The next step is to completely clear the damaged area of debris. With the area clean, windshield repair resin is forced into the damaged area until all the voids are filled. Heat is applied to the repair resin to begin the curing process. After about an hour of curing, your good-as-new windshield is ready for the road.