Here's the definitive way to handle a windshield crack. To start, you'll see some idiots on youtube talking about needing the right angle in the light or backing tape to se the crack. Don't be stupid. Just get a flashlight.
1) buy windshield repair kit.
2) take before pictures.
3) take a dremel glass bit and drill at the tip of the crack. this supposedly creates an area of stress relief and place for resin to enter at the tip of the crack.
4) tap with nail because someone on youtube told you so.
5) look at the hole and think to yourself "I need to stay off youtube"
6) apply resin and let sit till the air gets out.
7) put plastic strips ofer it and sit in sun to cure.
8) Scrape off excess and notice its only 10% better than it was, but now has a hole at the top.
9) try again because someone else on youtube told you so.
10) Scrape again.
11) take after picture, and realize its the same as the before picture, but with a dimple at the top of the crack
12) And lastly, call glass guy and ask when the fucking windshield is going to be in.