In case chip crack happens ,you have very short time before crack run fared ,special on summer time wen windshield get over 100 Fahrenheit&you; turn on your A/C. This quick change temperature make temple of glass have movement and make the crack start running ,first you have to due is put on the chip piece of clear tape. (helps keep out the air pressure wen you drive prevent run a crack)and call 760 6501516 in North County San Diego, Aguila De Coatza Auto Glass.Or risky choice go on line en buy kit due your self, for about $15-20 dollar&buy special dremel tool whit special drill bit for glass ,about $140.00 drill is critical part of the repair and you need very firm pulse & skills (you can make spread the crack ) to make the repair whit the  UV light cure resin.