Its important to note that the automobile windshield chip repair exterior trim and moldings that we can see on the outside of the glass are for looks only. The actual water seal comes from the "urethane" adhesive which is used to create the bond. Its in this urethane that the water leak is originating.
Good question. Windshield crack repair equipment varies widely among companies. High quality resins, injections and air removal methods vary from company to company and can affect the finished repair. Quality injection units and high quality resins are as important as the technicians performing the crack repairs. The quality resins create stronger bonds and resist yellowing better than inexpensive resins. Quality injection equipment will remove more air and the injection capabilities provide a higher quality crack repair.
A lot of people are confused between repair and replacement. There are those that opt for ready home kits to repair their windshields only to find out that they could not fix the problem. In essence, simple damage such as chips or cracks that is less than 3 inches can be repaired. However, when it becomes severe, you need to have it replaced. Also, damage within the critical vision area cannot be repaired so no matter how small it is, windshield replacement is the only solution.
There are many different repair kits that can be used for repairing your windshield. One excellent windshield repair kit is the Fix-A-Windshield, Do-It-Yourself Repair Kit. It comes at a very affordable price of $10 and contains all the necessary tools that you will need for repairing cracks in your windshield. This includes the clear resin bottle, and an air suction tool that removes air in between the break of the crack.
Still no big deal? In some states it's illegal to drive with a crack in the windshield that is in the driver's line of sight. In other states it's illegal to drive with a cracked windshield at all. I'd call that a big deal.
There are certain scratches that are advisable to be removed by buffing. If the scratch is too deep however, it is best to use resin to cover up the scratch. The rest of the window will be protected from further damage if the spider cracks are stopped in time.