Generally automobile windshield chip repair grow into cracks very quickly. Not taking the vehicle in to get it repaired immediately can result in a crack that is too wide to repair.
Insurance companies are more susceptible to cover the windshield if it is on the driver's side or if it is a more intense crack because it is more important to get it done in that case. They do not want any obstructions of view in the line of vision for the driver.
You get a chip on your windshield in less than a second. The most common cause is flying rocks. A crack can happen just as quickly as a chip. You never know when that small little chip is going to turn into a crack that completely hinders your view while you are driving. You may not know this but your windshield provides up to 30 percent of the structural strength of the vehicle. If your windshield is not strong then it affects the entire car. Driving over one bump in the road or a pothole can turn your chip into a crack which will mean you need more than just a repair, you will need professional auto windshield repair.
Now you have 3 options. You can pay out of pocket, you can have your insurance company cover the cost, or you can do the repair yourself. The cost out of pocket will vary from $30-$60, depending on the company you chose. Filing with insurance is easy because it is no cost to you, and the auto glass repair company deals with the paperwork. You can also attempt the repair yourself, but if you do not feel comfortable, i would suggest calling a professional. There is a good step by step windshield repair Instructable available, as well as other information online.
Carefully read and understand the instruction manual that comes with your newly purchased windshield repair kit before performing the repair. Now, here's how to fix the cracks on your windshield. First, use an auto glass cleaner to remove dirt from the crack and the area around it. Then dry the crack using a clean rag or towel. Use a safety pin to take out any remaining debris on the crack. Next place the suction cup onto the windshield using the adhesive included in the kit. Then mount the injector on the suction cup. Next, inject the resin; this will remove the air between the windshield and the suction cup.
But the best way to fix a leak is completely removing the glass and shooting a new seal. This is the only way to truly see what is happening. If the glass is removed a technician can 100% fix the underlying issue. This option may require the purchase of a new molding. Also your auto glass company will most likely require you to purchase a new glass if the old glass breaks upon removal.