3 DIY Methods How to Stop a Windshield Crack from Spreading (Actually Tested)

by | Jul 17, 2022 | Windshield

As a driver, there’s nothing more annoying than getting a chip or crack in your windshield. It seems to always happen at the most inconvenient time, and it can be hard to know how to fix it. If the crack is small, you might be able to get away with a cheap and fast repair solution. But what if the crack is bigger?

Read on for three DIY methods that will stop a windshield crack from spreading!

You can try a few different methods to prevent a windshield crack from spreading. One is to make a relief hole. This involves drilling a small hole at the end of the crack to relieve pressure and prevent it from spreading. Another method is to use a windshield repair kit and seal the crack with resin. This will fill the crack and help to hold it together. You can also try super glue or nail polish if you are on a budget, but this fix won’t last for a long time.

Reasons you have windshield cracks

Multiple stone chips and cracks on a windshield, close up

Many people experience the frustration of a cracked windshield, and it can be difficult to know how to prevent it. There are several common reasons for windshield cracks, and understanding them can help you to avoid costly repairs.

One of the most common causes of windshield damage is a rock chip. These occur when a small rock or piece of debris strikes the glass, causing a chip or crack.

Another common cause of windshield damage is temperature changes. As the temperature outside fluctuates, the glass expands and contracts, eventually leading to cracks.

Improper installation is also a common cause of windshield damage. If the glass is not installed correctly, it is more likely to crack or break under pressure.

Finally, freezing temperatures can also cause windshields to crack. When water gets into the cracks and freezes, it expands and puts additional stress on the glass, leading to further damage.

By understanding the causes of windshield damage, you can help prevent it from happening to your car.

Identify one of 3 types of crack on the windshield

3 Different types of cracks on a windshield comparison

There are 3 common types of glass crack: impact crack, stress crack, and pressure crack. Let’s look closer at each of them:

Impact crack

When a stone hits your windshield, it can leave behind a tiny chip. However, if the stone moves fast enough, it can cause an impact crack. This type of crack is characterized by a small bullseye in the center, with a network of cracks radiating outwards.

Impact cracks typically have sharp edges and can spread quickly, so it’s essential to have them repaired as soon as possible. Left unaddressed, an impact crack can weaken the structure of your windshield and make it more likely to break in the event of a collision.

Stress crack

Stress cracks are one of the most common types of windshield damage. They are caused by temperature fluctuations, typically from hot and cold weather exposure.

Stress cracks typically start at the edge of the windshield and spread inward. They can be either straight or curved. While stress cracks are not usually a safety concern, they can worsen over time and eventually lead to more serious damage.

Pressure cracks

Pressure cracks can occur for a variety of reasons. Sometimes, they result from improper installation, such as when the windshield is not properly secured to the car’s frame (pinch-weld).

In other cases, they may be caused by sudden temperature changes, such as when a car is parked in direct sunlight after being driven in cold weather.

Regardless of the cause, pressure cracks can weaken the windshield’s structure, making it more likely to break in an accident. As a result, it is important to have any pressure cracks repaired or the windshield replaced as soon as possible.

Why it’s important to keep windshield in good condition

Person cleaning car's windshield with fiber cloth

Car owners know that it’s important to keep their windshield in good condition. Not only does a clean windshield provide a clear view of the road, but it also helps to ensure the structural integrity of the car.

A cracked windshield can weaken the car’s frame, making it more likely to collapse in an accident.

In addition, a dirty windshield can make it difficult to see at night or in bad weather, increasing the risk of an accident.

That’s why it’s important to regularly clean and inspect your windshield and to repair any cracks or chips as soon as possible.

Urgent things to do if you spotted a tiny crack or stone chip

Tiny little stone chip on the car's windshield, close up

When you spot a small crack or chip in your windshield, it’s important to take action immediately. These small problems can quickly spread if left untreated and become much more difficult (and expensive) to repair.

One way to prevent the spread of damage is to cover the area with clear tape. This will help hold the glass in place and prevent debris from getting caught in the crack or chip and causing further damage.

Once you’ve taped up the area, you can take your car to a nearby auto shop to have the problem repaired. You can usually resolve the issue with quick action without too much hassle or expense.

Windshield repair options you have

3 windshield crack repair methods compared to each other

There are 3 most effective windshield crack and stone chip repair methods available:

Common method – Make a relief hole

One common windshield crack repair method is to make a small hole at the end of the crack. This helps to release the pressure that has built up behind the crack and can prevent the crack from spreading.

However, it is important to avoid overexposing the glass, as this can weaken the windshield’s structural integrity.

Once the hole has been made, it should be sealed with a clear adhesive. This will help to protect the top layer of glass from further damage.

Proper and expensive method – Seal crack with resin

One of the best ways to repair a windshield crack is to seal it with resin using a windshield repair kit. This method requires some practice and patience, and it can often cost some money as a good repair kit may cost a bit.

There are a few things you need to know before you start. First, make sure you read the instructions that come with your windshield repair kit carefully. This will help you avoid making any mistakes.

Second, take extra precautions when working with the resin. It can be dangerous if it gets on your skin or eyes.

Budget temporary method – Super glue

If you find yourself with a cracked windshield and a tight budget, you may be tempted to try a quick fix with super glue. After all, standard cyanoacrylate glue is designed to bond things together, so it should work perfectly for a windshield, right?

Unfortunately, super glue is not the best solution for a cracked windshield. While it can provide a temporary fix, it’s not as strong as an actually specialized resin.

You can also try to use clear acrylic nail polish instead of super glue. It will also seal the damaged place and prevent a crack from spreading.

Simply apply a small amount of nail polish or glue to the affected area and allow it to dry.

It is important to keep in mind that clear nail polish or super glue is not a permanent solution. It will eventually wear off, and the crack may continue to spread. For a more permanent fix, you will need to have the windshield replaced or use a professional repair kit.

Types of windshield crack repair kits available

2 types of windshield crack repair kits comparison

Depending on several factors like your needs, budget, damage type and location, there are 2 types of repair kit you can buy:


Most DIY kits come with a plastic pedestal, razor blades for removing debris and excessive resin from the crack, and a push pin for injecting resin into the crack. Once the resin has been injected, it must be cured with ultraviolet light.

Although DIY kits can be effective, it’s important to follow the instructions carefully to avoid making the problem worse.


If you have a windshield crack, you may consider a professional repair kit. These kits can be expensive, but they are reusable and high-quality.

The specialized resin used in these kits is designed to bond with the glass, creating a permanent repair. The metal pedestal provides a sturdy base for the repair, ensuring the glass will not crack under pressure. In addition, the diamond drill bit included in the kit helps to create a clean, precise hole for the resin to fill.

However, these kits require some experience to use effectively. If you are not confident in your ability to follow the instructions, it is best to leave the repair to a professional.

How location and length of crack affect your safety

Huge windshield crack and stone chip directly on the line of sight

Location and length of crack can drastically affect the windshield’s structural integrity. If the structural integrity of the windshield is compromised, it may not be able to protect you in the event of an accident.

Cracks that run along the windshield’s edge can weaken the glass’s structural integrity and make it more likely to break.

Cracks in your line of sight can also be dangerous, making it difficult to see clearly while driving.

In general, cracks that are shorter and closer to the center of the windshield are less likely to cause problems than those that are longer and located near the edge of the windshield. However, any crack has the potential to cause problems, so it is always best to have a cracked windshield repaired as soon as possible.,

When windshield replacement is necessary

Handsome technician installing a new windshield

Car windshields can be easily damaged by flying debris or severe weather. When this happens, it’s important to assess the damage and determine whether replacement is necessary.

Generally speaking, windshields should be replaced if they have multiple cracks, large chips, or extensive spider webbing.

However, small chips and isolated cracks can often be repaired.

Ultimately, the decision to replace or repair a damaged windshield will depend on the type and extent of the damage.


You now know three methods on how to stop a windshield crack from spreading. If you have a tiny chip or crack, it is important to take care of it as soon as possible because even the slightest damage can grow into a big problem down the road.

Depending on the size and location of the crack, one of three types of repair kits might be right for you. Remember that replacement might be necessary for your safety if your windshield is severely damaged.

Do you have any questions about windshield cracks? Let us know in the comments below!

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