Windshield Damage Guide — Understanding Chips, Cracks, and When Repair Works

Types of Windshield Damage

Not all windshield damage is the same. The type of impact, the angle of the strike, and the condition of the glass all affect what kind of damage results. Here's what we see most often:

Chip Damage

Chips are small impact points where a piece of glass has been knocked out or fractured, but no significant cracks extend from the point of impact. Most chips are caused by rocks or road debris hitting the windshield head-on.

Bull's Eye

A circular chip with a cone-shaped piece of glass missing from the outer layer. Looks like a small dark circle, usually about the size of a pencil eraser or smaller. This is the classic "rock chip" appearance and one of the most repairable damage types.

Half-Moon (Partial Bull's Eye)

Similar to a bull's eye but only partially circular — the impact hit at an angle rather than straight on. Equally repairable if the size is small.

Star Break

A central impact point with short cracks radiating outward like a star. The legs of the star are typically short (under an inch). Star breaks are repairable if the overall diameter is under 3 inches and the legs haven't started spreading.

Combination Break

Multiple damage types in one — for example, a bull's eye with a star pattern around it, or a chip with one or more short cracks extending from it. Repairability depends on total size.

Crack Damage

Cracks are lines of damage that extend across the glass. They can start from an impact point or appear spontaneously due to stress (temperature changes, manufacturing defects, or structural flex).

Stress Crack

A crack that appears without any visible impact point. Usually starts at the edge of the windshield and extends inward. Often caused by temperature extremes — that sudden crack you hear when you blast the defroster on a cold morning. Stress cracks almost always require replacement because they typically start at or reach the edge.

Floater Crack

A crack in the middle of the windshield that doesn't touch any edge. These sometimes start from invisible damage points or minor chips. If under 3 inches and not in the driver's line of sight, floater cracks can sometimes be repaired.

Edge Crack

A crack that starts within 2 inches of the windshield edge or reaches the edge. Edge cracks compromise structural integrity more severely than central damage and typically require replacement.

Pit Damage

Small divots or pockmarks in the glass, usually caused by sand or small debris at high speed. Individual pits aren't usually a problem, but heavy pitting across the windshield can cause glare and reduced visibility — especially at night or when the sun is low. Pitting can't be repaired; heavily pitted windshields eventually need replacement.

Repair vs. Replacement: The Decision Criteria

The fundamental question: can this damage be fixed with resin injection, or does the whole windshield need to come out? Several factors determine the answer.

Size

Industry standard says chips up to about 1 inch in diameter (roughly the size of a quarter) and cracks up to 3 inches long can usually be repaired. Some shops push these limits; we generally stay within them because larger repairs have higher failure rates.

Location

Where the damage sits on your windshield affects whether repair is appropriate:

• Driver's direct line of sight: Repair leaves a small visible mark. In your direct field of view, this can be distracting. Many drivers opt for replacement when damage is directly in front of them, even if technically repairable.
• Edge damage: Damage within 2 inches of any edge often can't be repaired because the repair equipment can't create a proper seal. Edge damage also affects structural integrity more seriously.
• Camera zone: If damage is in the area near your rearview mirror (where ADAS cameras are mounted), repair may interfere with camera function. We assess this case by case.
• Peripheral areas: Damage in the outer areas of the windshield is usually a good candidate for repair since visibility impact is minimal.

Depth

Your windshield is actually two layers of glass bonded to a plastic interlayer. Most chips and cracks affect only the outer layer — these are repairable. Damage that penetrates through both layers (you can feel it on the inside of the windshield) requires replacement.

Contamination

Repair works by injecting resin into the damaged area. If dirt, water, or cleaning chemicals have gotten into the crack, the resin can't bond properly. Fresh damage repairs better than damage that's been ignored for weeks.

This is why we tell people not to put tape over chips — the adhesive contaminates the damage and can make repair impossible. If you want to cover a chip temporarily, use a clear plastic bag or wrap loosely over the area.

Age and Spread

Damage that's actively spreading is harder to repair. If your crack gets longer every time you hit a bump, replacement is probably inevitable — repair might stop the spread temporarily, but the underlying stress is still there.

Quick Reference: Repair Likely vs. Replacement Needed

How Windshield Repair Works

Windshield repair is a straightforward process when done correctly. Understanding what's involved can help you set realistic expectations.

The Repair Process

1. Inspection: We examine the damage to confirm repair is appropriate. If replacement is actually needed, we'll tell you — there's no point wasting time on a repair that won't hold.
2. Cleaning: Any loose glass fragments are removed and the damaged area is cleaned. If moisture is present, we dry it before proceeding.
3. Resin injection: A specialized injector is positioned over the damage and professional-grade resin is forced into the chip or crack under pressure. The resin fills air pockets and bonds with the surrounding glass.
4. Curing: UV light hardens the resin, creating a permanent bond. This takes about 10-15 minutes.
5. Finishing: Excess resin is scraped away and the repair is polished smooth. The result should be nearly invisible from outside the vehicle.

What to Expect After Repair

A good repair restores structural integrity and prevents the damage from spreading. It does NOT make the damage invisible — a faint mark usually remains visible from certain angles or lighting conditions.

Repair success rate on appropriate damage (meeting the criteria above) is over 90%. The repair is permanent and lasts the life of the windshield. We warranty our repairs — if the damage spreads from a repaired point, we credit the repair cost toward replacement.

Learn more about our chip repair service →

Cost Comparison: Repair vs. Replacement

With South Carolina's zero-deductible glass law, either repair or replacement is typically covered at no cost if you have comprehensive insurance. We handle the insurance claim process for you.

View windshield replacement pricing and details →