How to Fix a Long Cracked Windshield at Home: DIY Repair Guide

A long crack in a windshield is a common issue that can happen to any vehicle. Deciding how to address it can be challenging. We must weigh the options: whether to opt for professional repair services or to tackle the problem ourselves.

Repairing a long crack at home is feasible. With precise guidance and the correct tools, it’s a task that we can undertake to save time and money.

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Before we start the repair process, it’s essential to understand the severity of the crack and make sure it’s something that can be managed at home.

Windshield repair kits are widely available, and they can address various types of damage from chips to long cracks. Being equipped with a DIY mentality and an attention to detail, we can restore our windshield’s integrity and clear visibility.

By fixing the crack promptly, we prevent the damage from worsening due to factors like temperature changes or road vibrations. Dealing with windshield cracks at home requires patience and a careful approach to ensure that the repair is effective and lasts.

The process involves cleaning the area, applying a repair resin, and allowing it to cure to reinforce the glass. We’ll go through these steps so that our windshield is as good as new, and we remain safe on the road.

Identifying Types of Windshield Damage

When assessing windshield damage, it’s crucial we recognize the type of damage to determine the correct method of repair.

Common types of windshield damage include:

Crack: A distinct line that can be felt with a fingernail, which may run horizontally, vertically, or in a spiderweb pattern.

Chip: A small break that can lead to larger cracks if not addressed promptly.

Bullseye: Circular damage with a cone in the outer layer of the glass.

Star Crack: A chip with short cracks leading away from the point of impact, resembling a starburst.


These types of damage are caused by various impacts such as flying debris or stress from temperature changes. Large cracks and long floater cracks in the windshield can be particularly dangerous as they compromise the structural integrity of the laminated glass.

Identifying this damage involves carefully examining the windshield and categorizing each mark as follows:

Type of Damage Appearance Common Causes Risk Level
Crack Long thin line Impact, stress High if length increases
Chip Small divot Debris Medium, may spread
Bullseye Circular with a center impact point Flying pebbles Medium, may spread
Star Crack Central impact with radiating lines Sharp impact High, prone to spreading

Correctly identifying these types of damage is our first step towards a successful home repair. Different techniques and materials may be required depending on the extent and type of the damage to the windshield.

DIY Windshield Repair Steps

Repairing a windshield crack at home can be straightforward with the right tools and techniques. By following these steps carefully, we can fix long cracks and restore the windshield’s integrity and visibility.

Evaluating the Impact and Preparing the Windshield

Assessment: Before starting the repair, it’s crucial to assess the damage. Check the type of crack and ensure it’s within a repairable size. Cracks longer than a dollar bill typically require professional attention.

Cleaning: Using a glass cleaner, thoroughly clean the area around the crack. Remove all debris and dirt for the resin to bond properly. A razor blade can help in removing stubborn particles from the impact point.

Applying the Repair Resin

Filling the Crack: Choose a high-quality windshield repair kit. Follow the manufacturer’s instructions to insert the resin into the crack using the applicator or syringe. It’s essential to do this in temperatures above 50°F for optimal curing.

Removing Air Bubbles: After the resin is applied, use a tool to apply pressure and remove any air bubbles. This might be a pressure driver or vacuum function included in the kit.

Finishing Touches: Curing and Polishing

Curing the Resin: Apply a curing strip over the resin and allow it to cure fully. Avoid direct sunlight until the repair area is ready for exposure.

Polishing: Once the resin has cured, remove any excess with a razor blade. Use polish over the area to achieve a smooth, clear finish.

Assessing Professional Windshield Repair and Replacement Options

When facing windshield cracks that compromise visibility or the structural integrity of the vehicle, it’s crucial that we assess professional windshield repair and replacement options.

Repair or Replace?

Windshield replacement may be the only viable option if the crack is significantly long, deep, or located around the windshield’s edges. In cases where visibility is affected, especially on the driver’s side, replacing the windshield is typically mandatory to meet state inspection standards.

Excess resin or improper repair can lead to both visual impairment and further damage.

Options for Professional Repair: Small cracks or chips caused by pebbles or other debris can sometimes be repaired with a resin that professionals apply under vacuum conditions. Repairs are usually a quicker and more cost-effective solution provided that the windshield’s structural integrity isn’t compromised.

Factor Consideration
Time Repairs can often be completed quickly, sometimes even at your location.
Environment Weather can influence the decision, as certain repair materials require specific conditions to set properly.

Timing is another factor; some resins used in windshield repair may need to cure in particular weather conditions. Furthermore, time is of the essence to prevent dirt and moisture from compromising the repair process.

Environmental and Safety Considerations

When we address the repair of a cracked windshield, it’s crucial to consider both the environmental factors and the safety implications.

The conditions in which we perform the repair can significantly affect the quality and effectiveness of the fix.

We’ll look at temperature, moisture, and other environmental considerations, as well as safety measures to protect both the vehicle and ourselves.


Resin used in windshield repair requires a certain temperature range, typically above 50°F (10°C), to cure properly.

If the temperature is too low, the resin won’t set correctly, compromising the repair.

Avoid direct sunlight as it can cause the resin to cure too quickly, leading to a poor seal.

Moisture and Weather:

Ensure the environment is dry. Moisture can prevent the resin from adhering properly, resulting in a weak repair.

Always check the weather forecast; we don’t want rain to compromise our repair.

Safety Gear:

Wear safety gloves and glasses to protect from glass shards and chemicals.

Vehicle and Visibility:

Be mindful of the auto glass’s structural integrity. A windshield provides up to 30% of a vehicle’s structural strength.

A repair should not only restore visibility but ensure the windshield can withstand the rigors of driving.

Never compromise on clarity. A poorly repaired windshield can distort visibility, which can be dangerous in conditions like fog or heavy rain.
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