If you have a crack in your windshield here are some tips they provide for minimizing further damage until you get it fixed or replaced:
Use a specialist. A general mechanic won’t do in these instances, so use an auto-glass-repair specialist. The glass installer should be AGRSS registered and has National Glass Association-trained technicians. In some cases, mobile glass installers will come to you.
Get rid of dirt: If dirt gets into a crack or chip, it can prove more difficult to repair. Place a small piece of clear tape over the point of impact, but only if it doesn’t block your vision.
Temperature changes: Extreme temperature and cracked windshields don’t get along. Keep your car out of the sun when parked, as the heat builds up and weakens the windshield, causing the crack to get even bigger.
Air conditioning/defrosting: When you get into your car, don’t turn the air conditioning or use your defroster on high. Let your car cool down or warm up gradually on a lower setting.
Don’t wash: Think of it as an excuse to not wash your car for a bit, as water in the damaged area can cause your windshield to crack even more.
Don’t jolt your car or windows: When getting in and out of your car, don’t slam the door while the windows are all the way up. The extra pressure inside the vehicle can cause the crack to spread.
