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.
It's the same thing with a windshield. Why would anyone want to repair a windshield which is the only thing that protects you from oncoming objects to your face? Having a solid windshield in your car rather than a repaired one is probably safer and to me makes more sense.
Check with your insurance, because it's likely your insurance will pay for some forms of windshield chip repair. They may even waive the deductible, since repairing your windshield is so much cheaper than replacing a windshield. Should you need total windshield replacement, you may have to pay a deductible with your insurance.
The secret to doing a lot of repairs is knowing where and how to contact people. Mostly it is a function of letting them know you there and able to do the repair. Problem is most people wake up thinking about how to find someone who needs windshield repair.
Jolt your car or windows. Try to avoid slamming doors or shutting doors with the windows all the way up. Creating extra pressure inside the vehicle in this way can cause the crack to spread.
Dash repair is an art and a craft, just like all automotive interior repairs. If the steps are followed right and patience is used in your repairs you success will be good.