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.

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.
Warranties may not seem important, but they really are when it comes to windshields and fix auto glass. A reputable company will certainly stand behind their work and have no problem guaranteeing that work. Any future incident could be the result of work that was not done well and you want to make sure that you have a recourse that will not have additional costs.
If you will allow a chip or small crack in your windshield for you are thinking that it's just nothing, you are definitely getting into the wrong way. You don't need to wait for what's next, that small chip or crack might get worsen. Thus, be ready with your windshield repair kits most of the time and try to update the content each time.
Stay away from the sun. Park inside a garage when you can and use a protective windshield covering when you can't. If you let heat build up inside the car while you park, you might weaken the windshield and cause the crack to grow.
While there are many things that can go without fixing for a while these are just a few of the issues that should be addressed as soon as they arise. This type of automobile repair is crucial to keep vital systems running. So remember you may be able to make a couple hundred more miles with those worn out windshield wipers but when your tread runs low, or your windshield gets dinged get it to a mechanic right away.