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2 How to fix a cracked windshield

The structure of a car windshield consists of two layers of green-resistant glass. In particular, in between these two layers, there is a layer of Polyvinyl Butyral (PVB) plastic that is tightly pressed together under high pressure and temperature.

As a result, when there is a strong impact, the glass will break into pieces, but the shards will not be thrown, causing danger to people around.

But when it is impacted by an object like a stone or gravel, it will crack. In this case you may think of taking your car to the repair shop. However, there is a more economical way to deal with this problem.

So how to fix a cracked windshield without taking an expensive trip to the glass shop or the garages. You will get the answer in this article.

How to fix a cracked windshield

Using RainX 

How to fix a cracked windshield

Manufacturer ‎Rain-X
Brand ‎Rain-X
Model ‎Windshield Repair Kit
Item Weight ‎2.4 ounces
Product Dimensions ‎1 x 4.38 x 8.56 inches
Item model number ‎161890
Is Discontinued By Manufacturer ‎No
Manufacturer Part Number ‎161890
Folding ‎No
Cover Included ‎Windshield Repair Kit

You can buy it on

Using Windshield Repair Kits

How to fix a cracked windshield

Windshield crack repair kits are a useful tool when you seek for how to fix a cracked windshield on your own. 

They can be found in the auto parts department of many retailers like Walmart and Target, as well as more traditional auto parts stores like Pep Boys and AutoZone. 

Failing that, the warehouse-distributor auto parts stores that cater to professional mechanics can supply you. 

Of course, there’s also Amazon, which can sling a repair kit to your door usually overnight. A good gauge there is the customer reviews, and our survey found multiple options from Permatex, RainX, ARISD, Loctite, and Gliston.

Procedures differ marginally, but the principle is the same. We fixed a couple of windshields to test some of these products, and the results were excellent. 

Read our report below—but regardless of which kit you use, remember to start with an absolutely dry windshield that’s somewhere near the room temperature.

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You don’t want to trap any water in the repair, so use a hair dryer if the window is wet.

If the surface is dirty, don’t use any detergents or window cleaner. Lighter fluid or acetone can help dry and clean the surface, but don’t use so much that it dribbles down the glass and peels the paint, or worse

You can do fix a cracked windshield by following these steps:

How to fix a cracked windshield

Step 1: Pre-Mixed Adhesive

We first used a simple kit from Loctite with a one-part adhesive and an uncomplicated syringe to apply it. 

Start by peeling off the backing film on one side of the precut adhesive strip and applying it to the pre-cleaned glass, centered over the chip. Burnish with the back of your thumbnail or a blunt object. Now peel the remaining film.

Orient the plastic adapter so that the fitting is as close to vertical as possible and stick it to the film. Burnish again. 

Pull the cap off the syringe, keeping it pointy-end-up so the adhesive doesn’t wind up on the fender. Attach the syringe to the adapter.

Now here’s the tricky part: Lay your watch down somewhere so you can see the second hand, or set up your smartphone in stopwatch mode.

Grasp the syringe body with one hand to stabilize it, and pull the handle of the syringe out as far as it will go. Hold the handle in this position for a full minute. This pulls a partial vacuum in the syringe—and in the crack.

While you’re holding this vacuum, the air in the crack bubbles up through the adhesive in the syringe, while adhesive creeps down toward the glass and chip. Now let go of the handle. 

Don’t follow the handle, but let it go abruptly. The pressure wave from the handle slamming down will force adhesive into the crack.

Step 2: Two-Part Adhesive

We also tried a repair kit that used a two-part adhesive. These are far less common – though you might find them in your search and be forced to use one in a pinch – and they require users to mix two small vials of adhesive and hardener in the syringe before starting, which was simple.

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The adhesive disc and syringe adapter are similar, if not identical, to the simpler kit’s, and are applied in an identical fashion. 

The syringe, however, is more complex. It uses a wire latch arrangement on the body that drops into two notches on the handle when necessary.

A simple push pin stuck into the body serves as a very crude valve to let air in and out of the body. Once the syringe is attached to the adapter (the adapter already being stuck airtight to the glass), you remove the pushpin. 

Then you bottom the syringe plunger, pushing the air out, insert the pin, and pull the handle out until the clip clicks into the slot. This will hold the plunger out, and the partial vacuum under it for the designated time.

Rather than rapidly releasing the pressure like you do with the Loctite kit, in this case you remove the pin, admitting air into the syringe barrel. 

Then you replace the pin, sealing the hole, followed by releasing the clip, pushing the handle in to lightly pressurize the barrel and force adhesive into the chip for a minute or so. 

The second slot will trap the clip as soon as you’ve pushed in far enough. Repeat this “vent, suck, vent, squeeze” operation several times to force adhesive into the crack.


How to fix a cracked windshield

When you notice a small crack or rock chip, don’t wait. If another rock hits, the entire windshield can crack, requiring complete replacement.

Don’t hesitate, You may take your car to a prestigious car garage or repair them yourself by following the ways that I gave on how to fix a cracked windshield. Good luck to you!



Can a windshield crack be repaired?


Definitely yes. It doesn’t matter how long the windshield crack is, you can repair or have it repaired by bridging the gap with a special resin. 

However, it’s advisable that you do not let the crack spread too long as it will be more costly to repair it and to some extent, you may have to have the whole windshield replaced.

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How much does a crack in the windshield cost to fix?


The answer to this question varies by location and the length of the crack. On average, if your crack is just a single chip, you may have to spend about $60 – $100 to get it fixed. 

And normally, mechanics will offer you a discount as there are additional chips on your windshield. 

And if your crack is a long one, you may have to spend at least $125 to help your windshield restore to its fine look.


How long will a cracked windshield last?


To be honest, this is a tough question. There is nothing like a fixed amount of time that you can have a safe and sound drive with a cracked windshield. 

You can drive for a few days, weeks or even months with a cracked windshield if your car suffers from a small crack which stands a slim chance of spreading. But if it’s a big crack, it’s hard to tell how long.


How much does a new windshield cost?


It depends on the type of auto glass company you hire to do the replacement job and the location where your car undergoes the fixing process. 

But you can expect that you will have to spend from $200 to $400 having your windshield replaced.


Is there a way to stop the windshield crack from spreading?


Yes, there is. You can apply superglue or clear nail polish to prevent the spreading process from happening. 

However, this method doesn’t work 100%. Sometimes, it works but sometimes it doesn’t so you should know that you can’t entirely rely on this technique. 

And to increase the possibility of success, you should clean your windshield first with the auto glass cleaner and paper towels then apply superglue or clear nail polish to make sure that your windshield’s surface is dust-free.


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