Will a Windshield Crack Spread?
Yes, a windshield crack will spread over time if left untreated. Even small chips or cracks can grow larger due to factors like temperature changes, road vibrations, and moisture.
Why Do Windshield Cracks Spread?
1. Temperature Changes
✔ Heat and Cold Expansion – Glass expands in heat and contracts in cold, which puts stress on the crack and makes it spread.
✔ Defrosting & Sun Exposure – Using a defroster or parking in direct sunlight can worsen the crack.
2. Road Vibrations & Pressure
✔ Driving Over Bumps – Uneven roads, potholes, and vibrations from driving put pressure on the glass, causing the crack to grow.
✔ Closing Car Doors Hard – Slamming doors can create a shockwave that spreads the crack.
3. Moisture & Dirt
✔ Water Seeping In – Rain or car washes can let moisture into the crack, making it worse when it freezes and expands.
✔ Dirt & Debris – Dust and grime can weaken the glass structure over time.
How Long Before a Crack Spreads?
- Small chips (less than 1 inch) can stay stable for a while but may still spread.
- Longer cracks (over 6 inches) are more likely to expand quickly.
- Cracks tend to spread faster in extreme weather conditions.
How to Stop a Windshield Crack from Spreading
1. Apply Clear Nail Polish or Super Glue (Temporary Fix)
✔ Helps seal the crack and prevent dirt and moisture from getting in.
✔ Only a short-term solution – get it repaired ASAP.
2. Use a Windshield Repair Kit
✔ Available at auto stores, these kits inject resin to stop further cracking.
3. Avoid Sudden Temperature Changes
✔ Don’t use hot water on a frozen windshield.
✔ Park in shade to prevent sun expansion.
4. Get It Professionally Repaired
✔ If the crack is small, a repair shop can fill it with resin to prevent spreading.
✔ If the crack is large (over 6 inches), windshield replacement is the safest option.
FAQs
1. Will a small crack on my windshield get bigger?
Yes, even tiny cracks can spread over time due to vibrations, temperature changes, and moisture.
2. Can I still drive with a cracked windshield?
You can drive with a small crack, but if it obstructs your vision or grows larger, it’s best to repair it immediately.
3. How much does it cost to fix a windshield crack?
- Small chip repair: $50–$150
- Full windshield replacement: $200–$600+
4. Does insurance cover windshield crack repair?
Many insurance policies cover chip repairs for free if you have comprehensive coverage.
5. Should I replace or repair my windshield?
- If the crack is small (less than a quarter in size), repair it.
- If the crack is large, deep, or near the edges, replace the windshield.
Conclusion
Windshield cracks will spread if left untreated, especially due to temperature changes, road vibrations, and moisture. Temporary fixes like nail polish or repair kits can help, but professional repair or replacement is the best long-term solution. Fixing it early can save you money and keep you safe on the road.
