Your technician should discuss with you the adhesive used and the time it takes for it to properly bond the auto glass to your vehicle. This lets you make an informed decision as to when you feel the car is automobile windshield chip repair safe to drive.
First things first the chip should be repaired before it gets filled with grit. To do this, the chip needs to be drilled while the cracks in it get vacuumed. An acrylic or crystalene resin is then inserted via syringe into the chip to restore the air trapped in the crack. Afterwards it is dried with UV light which hardens the substance and reinstates the original state of the glass. Acrylic resin is made up of carcinogenic acid which turns the chips yellow over time. Crystalene resin has better clarity and doesn't change color over time. It's available at ultra-low consistency and high consistency. Extra resin is scraped away and then polished for a finishing touch. This kind of treatment usually runs about $45-$100.
Now that you know what can and can't be repaired, there's one more thing to consider. Time!! Many factors like extreme heat or cold and even your air conditioning cooling down the windshield on a hot day can cause the damage to get worse. The longer you wait to repair the damage, it could spread and may turn a repairable situation into a full blown automobile windshield chip repair costing YOU more. Most insurance companies WILL cover a rock chip on the windshield at no cost to you. Speak with your insurance agent to get more information on what they will cover when it comes to windshield damage.
Do-it-yourself repairs are the cheapest option but if not done correctly, it may cost you more. If you plan to do it yourself, it is important to choose the best kits. Research or seek the advice of experts so you would not be sorry. There are two types of windshield repair kits. The first is the less expensive syringe-type. The kit includes a syringe and the resin, intended for one-time use only. It contains just enough resin to repair one chip. The second type is the more expensive bridge system that includes the resin's and a plastic bridge. This type can be used several times because it is refillable.
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.