Why cracks spread (especially here)
Glass expands and contracts with temperature, and a crack is a weak point where that stress concentrates. Philadelphia's freeze-thaw winters, blasting defrosters, and pothole-jarring roads are a perfect storm for turning a stable crack into a running one — sometimes overnight.
Do these to slow it down
- Keep the temperature gradual — avoid blasting the defroster on max onto cold glass
- Park in the shade in summer and a garage in winter when you can
- Cover the crack with clear tape to keep dirt and moisture out (temporary only)
- Drive gently over bumps and potholes
- Get it looked at fast — the #1 way to stop spread is a professional crack repair
Avoid these
- Don't use DIY resin kits on longer cracks — they often make a proper repair harder
- Don't slam doors (the pressure spike stresses the glass)
- Don't run the AC on max onto a hot windshield
- Don't wait "to see what happens" — cracks rarely stop on their own
Frequently Asked Questions
How long before a crack becomes unrepairable?
There's no fixed timer — one cold night or one pothole can do it. That's why acting within days, not weeks, gives you the best shot at a repair instead of a replacement.
Does tape actually help?
Only as a short-term measure to keep the crack clean and dry so it can still be repaired. It doesn't stop the spread — get it professionally handled soon.
Need a hand with your windshield? We offer same-day mobile repair and replacement across Philadelphia. Call (215) 918-7085 for a free quote.