No matter how much we would all love it, cars aren’t impermeable to wear and tear. The breaks discs get worn out, the interior slowly loses its luster over the years. All we can do is give our best to maintain it to the best of our possibilities.
The same is true for windows. Over the years, the rubber and glue keeping it in place may start coming off. And when that starts happening, you’re going to need a windshield sealant.
I’ve spent two dozen hours researching these products, so you don’t have to. Join me today and learn which are the five best windshield sealants you can buy today!
In a Hurry? The Winner after 26 Hours of Research:
How I Picked:
133 Reviews Compared
26 Hours Of Research
34 Popular Products Considered
Last Updated: June 09, 2021
By James Ruhle: This article has been updated to reflect the most accurate information regarding best windshield sealants available for those who are interested in sealing cracks on the windshield the best way. The best 5 available have changed, and information has been added to assist individuals in finding the best windshield sealants currently available on the market. The FAQ has also been updated.
Current Top Windshield Sealants On The Market- Comparison Table
Can Be Used To Seal
Glass, metal, ABS, ceramics, plastic, and rubber
Glass, metal, ABS, ceramics, wood, and rubber
Metal, glass, and plastic
Glass and metal only
5 Best Windshield Sealants Reviewed
If you’ve accidentally cracked your windshield glass, you’re potentially risking water getting inside your car. This won’t just result in a mild inconvenience. The repercussions can be quite severe. Not only are you going to be greeted by an unpleasant odor each time you open your car – but you’re are also risking ruining your dashboard and the wiring beneath it.
This is why you must seal up any windshield leaks as soon as possible. You can take your car to a dealership and get ripped off, or you can get a tube of windshield sealant and fix the problem for around $20.
Unfortunately, the market is flooded with all kinds of sealants, and not all of them are that good. This is why I decided to spend some time researching these products, so you don’t end up with a tube of silicone that’s good for nothing. After hours spent browsing different stores, I give you the five best car windshield sealants you find in 2021.
1. Loctite Clear Silicone Waterproof Sealant - Editor’s Choice
Our Rating: 95/100
Loctite is a household name for adhesive. This company's name is ubiquitous with super glue. Another thing this company is good at is making sealants. Loctite Clear Silicone windshield sealant is just as amazing as their superglue. What's more, you can use it to fix just about anything, be it glass metal, or plastic.
This sealant is excellent for fixing up most cracks on your windshield. Because it's silicone-based, you can rest assured it will keep the water away even in a downpour. Thanks to its amazing adhesive properties, this windshield sealant can bond almost any two materials together. This is excellent news if you're having trouble with your stop lights starting to come off.
Just like all Loctite products, once this windshield sealant cures, it won't expand or contract. This ensures the crack you've sealed won't start leaking again after just a couple of days. I also love how fast it cures. I used this sealant to fix a cracked jar to test it out, and after just a couple of minutes, it was completely hard. I waited for an hour and did a water test, and no water leaked!
The only thing I don't like about this windshield sealant is the packaging. For some reason, if you start squeezing out the tube's contents from the middle, there is a chance the bottom will rupture and spill the sealant everywhere. This is why I recommend you squeeze it from the bottom, so you don't end up in a messy situation.
Our Rating: 85/100
No matter how carefully you drive, there is always a chase you run into a bird or an exceptionally hard insect that’ll nick your windshield. These small nicks and cracks are the most common cause of windshield damage. Thankfully, this damage is quite easy to repair with Permatex 81730 Flowable Silicone Windshield and Glass Sealer!
This glass sealant is specially designed to easily flow into cracks and nicks so it can form a clear, solid layer of protection. This seal is not only fully waterproof but is also resistant to vibrations and extreme temperatures. Once you apply it, you can rest assured this sealant won’t let any water through no, whether it’s summer or winter.
The application is as easy as pie. All you have to do is clean out the area you want to fix and start pouring the sealant. The sealant will flow into all nooks and crannies and begin forming a clear seal. Just make sure it doesn’t leak anywhere else because it will form stains.
Once you’ve applied this glass sealant, it will take around an hour to harden. After another 24 hours, it will fully cure.
My only issue with this silicone sealant is that it’s a bit too liquid. If it was a bit tackier, you wouldn’t have to be so careful when applying it. I also don’t like how it stains anything it comes in contact with.
Our Rating: 80/100
The windows are not the only type of glass that can crack or fall off. The lights and the mirrors are just as easily suffer damage. Signal and stop lights are notorious for getting easily damaged. And when that happens, you're going to need an exceptionally durable sealant.
One such sealant is J-B Weld 31319 RTV Silicone Sealant and Adhesive. This sealant is specially designed to withstand harsh elements and remain in place. Once it cures, it won't shrink or expand, no matter how extreme the temperature outside. On top of that, it forms a fully waterproof seal.
The best thing about this sealant is that it comes in more than a dozen different colors. You can choose between clear, blue, red, black, white, gray, and copper. Depending on the type of repair, you can use a different color.
When it comes to ease of use, this sealant is relatively easy to apply. Even though it's quite liquid, it's just a tad bit too tacky to flow in all the nooks and crannies. This is why I recommend you use an index card to smooth it over and push it into the crack to form a better seal.
The cure time is standard for this type of product. It will fully harden after an hour, and it will fully cure after a day. After it's fully cured, I recommend you do a water test because there is a slight chance this sealant hasn't filled out the entire crack.
If you’re looking for a windshield sealant that will allow you to glue a new windshield yourself, look no further than 3M Auto Glass Urethane Windshield Adhesive. This sealant is extremely durable and won’t lose its adhesive properties even under extreme temperatures.
3M sealant is specially designed to allow you to replace auto glass by yourself. Of course, you can also use it to fix your tail glass, and just about anything that gets unglued from your car.
The one thing you can’t do with this windshield sealant is fixing small cracks. Since this is a urethane-based sealant, it won’t become clear once it cures. Quite the contrary, this sealant is jet-black. This means you can’t use it for much else but for replacing the auto glass.
When it comes to curing, 3M Auto Glass Urethane Windshield Adhesive is designed to cure without sagging or bulging. This ensures the windshield doesn’t move while the sealant cures. Thankfully, once you apply it, you have around 10 minutes to adjust the windshield before the sealant becomes too hard.
The two things I found annoying about this product is how long it takes to cure, and how it stains everything it touches. Depending on the weather conditions, it will take around 48 hours to completely cure. If you accidentally spill anywhere, you won’t be able to clean the stain.
You don't have to crack your glass windshield to damage it. All it takes is daily wear and tear. For instance, each time you turn on the wipers, you are scraping the windshield's surface. Given enough time, the wipers can cause so much damage that you can hardly see through the glass.
If you're dealing with a windshield with lots of small nicks and scrapes, you can quickly fix it with Griots Garage 11033 Glass Sealant. This product will breathe in new life into your old, nicked up windshield thanks to its unique water-repelling formula.
This sealant is designed to form a robust and transparent coating that's extremely hydrophobic. This means water droplets won't stick to the windshield, which ensures a more comfortable driving experience.
Previous sealants, you can't use Griot's Garage to fix a crack. Instead, it would be best if you used this windshield sealant to fix any small nicks and scratches on the windshield and other car windows and make them water repellant, so you have better visibility when it's raining.
The only thing I don't like about this windshield sealant is how tedious it is to apply. You have to use a cloth to apply the coat evenly, wait for it to dry, then apply a second coating. Once the second coat has cured, then you have to buff it until it becomes clear.
Windshield Sealants FAQ
Q: What can I use to seal a leaking windshield?
A: If your windshield is leaking water, you have two solutions. The first solution is to take your car to a dealership or an authorized mechanic and get the auto glass repaired. Unfortunately, a new windshield can cost you hundreds of dollars. And since we’re living in chaotic times, not everyone has the time to take their car to a dealership.
The second option is using a car windshield sealant. These specially designed sealants will seal up most cracks in the glass. Unfortunately, these products aren’t capable of sealing big cracks. Still, they’re excellent for fixing the most common cracks like a small nick in the glass, small cracks in the corners, or parts where the rubber has started peeling off.
Q: How much does it cost to seal a windshield?
A: Sealing a windshield will cost you more time than money. Most sealants cost around $20, but it will take up to half an hour to apply it.
Before applying the sealant, you have to sand down any rough edges and clean everything with a cloth and paint thinner. After you’ve prepared the surface, you can start applying the sealant. Use an index card to smooth any rough edges - wait a couple of minutes for everything to dry, and you’re done!
Q: How do you remove old windshield sealant?
A: How easy a windshield sealant depends on what it's made out of. If you’re dealing with urethane-based sealant, you’re in luck because it comes off quite easy using acetone and some acetone grease.
On the other hand, if you’re dealing with a silicone sealant, you’re going to have a bad day. Since this material is almost insoluble in most solutions, all you can do is use a box cutter to slowly scrape it off.
After It's All Said and Done, I Recommend:
Choosing the right windshield sealant can be quite tricky. Still, I hope this article helped you find the right product for your needs.
With that said, I've chosen Loctite Clear Silicone Waterproof Sealant as the best windshield sealant because it offers the best mix of ease of use and price.
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