Best Windshield Sealant Reviews Buying Guide and FAQs in 2020

If you've noticed water seeping into your car’s cabin you may just have a leaky windshield. Thankfully, there are hundreds of options on the market and to help, we've rounded up some of our top picks for your perusal! Read on to find out all that you need to know about windshield sealants and adhesives.

Comparison Table for Best Windshield Sealants on The Market in 2020

Name

Type

Suitable for:

Can it be used without tools?

Price

Permatex 81730

Liquid

Small and hard to reach leaks

Yes

3M Auto Glass Urethane Windshield Adhesive

Paste

Windshield resealing

No

J-B Weld 31319 RTV Silicone Sealant and Adhesive

Paste

Quick fixes and patches

Yes

Captain Tolley's Creeping Crack Cure

Liquid

Cracked glass

Yes

SIKA Auto Glass Sealant Windshield Urethane Glue

Paste

Windshield resealing

No

Permatex 81173 Black Silicone Adhesive Sealant

Paste

Quick fixes and patches

Yes

1. Permatex 81730 Flowable Silicone Windshield and Glass Sealer - Overall Best in 2020

Not all pesky leaks require a specialist solution. The Permatex 81730 Silicone Windshield and Glass Sealer is one of those products aimed at the DIY end of the market and allows you to effectively seal off leaks quickly and easily without too much hassle. Since 1909, Permatex has led the development of innovative new products and services for both automotive professionals and DIY users. And their Flowable Silicone Windshield and Glass Sealer is one of their best products yet.

Features & Benefits of Permatex 81730

  • Easy to Use: Permatex Flowable makes it on to our list of best windshield sealants by being one of the easiest and intuitive products on the market. Thanks to its pour and set nature, the Permatex solution allows you to quickly and effectively solve leaking windshield surrounds.
  • Hidden Areas Fixed TooThanks to Permatex's easy-to-use and extremely flowable solution, the Silicone Windshield, and Glass Sealant can get into hard-to-reach and hidden areas with ease. By maintaining its viscosity before hardening the liquid will seek out even the smallest of channels that may give way to water ingress.
  • DurableThe Permatex 81730 Silicone Windshield and Glass Sealer is designed for long-life in a variety of conditions. Therefore, Permatex has rated it as waterproof and weather-resistant and is durable against extreme temperatures, shocks, and vibrations.
  • Clear FormulaThe Permatex 81730 Silicone Windshield and Glass Sealer dries to a clear and transparent hardened compound. This is especially handy for bits of the liquid that may have run onto the windshield or even dots or spots that dry just before sealing any leak. The clear formula makes any fixes virtually untraceable.
  • A Wide Variety of ApplicationsThe Permatex 81730 windshield sealant can be used on a wide range of applications—not just windshields and not just automotive! Permatex recommends the Windshield and Glass Sealer for use on hatches, sunroofs, headlight assemblies, marine glass, RV vents, and windows around the home.

Pros

  • Quick-acting Formula
  • Seeks out even the smallest of leaks
  • Requires no experience or tools
  • Versatile application
  • Weatherproof and durable

Cons

  • Not ideal for large leaks
  • Can be hard to identify underlying issues (eg: rust)

Verdict

A great product to use to seal-off hard-to-find and annoying leaks around a windshield surround. From a trusted name and with many glowing reviews you’re bound not to go wrong with the Flowable Silicone Windshield and Glass Sealer.

2. 3M Auto Glass Urethane Windshield Adhesive

When it comes to trusted names, it's hard to beat the heritage and legacy of 3M. Their Auto Glass Urethane Windshield Adhesive makes it to our list of best windshield sealants by virtue of its OEM-beating strength, and total windscreen-reseal applications.

Features and Benefits of 3M Auto Glass Urethane Windshield Adhesive

  • Stronger Than OEM: 3M claims that their Auto Glass Urethane Windshield Adhesive is stronger than OEM standards. This will no doubt give you peace of mind that, in the event of having to reseal a factory-sealed windshield, the 3M windshield sealant will not let you down.
  • Single Component Formula3M's Auto Glass Urethane Windshield Adhesive is of the one-part type, requiring no mixing of different solvents and hardeners. The premixed liquid is easy and quick to apply, without the hassle experienced with other systems, allowing you to use it without worrying about mixing containers or application time.
  • Ideal for lights tooThis 3M windshield sealant can also be used for automotive applications besides windshields. 3M recommends the Auto Glass Urethane adhesive for other stationary glass attachments, such as the backing of taillights and sidelights, making one canister suitable for a variety of uses around the car or workshop.
  • Fast CuringIdeal for time-sensitive jobs, 3M's windshield sealant will dry and cure to a strong bond rapidly when compared to other products on the market. This can be especially advantageous for those time-sensitive jobs that require a quick turnaround, either at a workshop or on your sole means of transport.
  • The Ideal Viscosity: The 3M Auto Glass Urethane Windshield Adhesive has been chemically designed to reduce sagging while maintaining what is referred to as a medium viscosity. This allows it to be applied with minimum fuss for a quick and clean job

Pros

  • High-strength "stronger than OEM" formulation
  • Quick curing time for fast results
  • Ideal for complete windscreen re-installations
  • No mixing required
  • Can be used for multiple stationary glass applications

Cons

  • Mostly geared towards professional application
  • Not suitable for smaller "touch up" jobs
  • Requires an applicator and basic tools

Verdict

There's no doubt that the 3M Auto Glass Urethane Windshield Adhesives is one of the best windscreen sealants on the market today. It's exceptionally strong, can be used for multiple automotive glass usages, and comes from a trusted name. However, it's also best suited for professional applications, as evidenced by the need to use a specialty applicator.

3. J-B Weld 31319 RTV Silicone Sealant and Adhesive

A brand that needs little introduction, J-B Weld is a popular name when it comes to adhesives and the best windscreen sealants. With over forty years of trust, their RTV Silicone Sealant and Adhesive promise to be just as effective for windscreen applications.

Features & Benefits of ​J-B Weld 31319

  • Great for Small Jobs: Available in a smaller size for small jobs, the RTV Silicone Sealant and Adhesive is a great solution for minor work. It's ideal for rectifying small areas of windscreen leakage and means you won't be wasting product that you may not need.
  • Suitable for WindshieldsWith many potential uses listed, the J-B Weld 31319 RTV will provide just as an effective sealant for your windshield. Although bigger jobs (such as windshield refitting) will likely require larger quantities, it's a great way to ensure that your windshield stays in place.
  • Cures quickWith a fairly quick curing time, the J-B Weld RTV Silicone Sealant is one of the quickest drying and fastest curing solutions on the market. This makes it ideal for a quick fix if you're caught in a downpour with a leaking windshield surround.
  • Stays FlexibleIn order to resist vibrations and minimize the risk of cracking due to temperature fluctuations, the J-B Weld Silicone Sealant makes itself one of the best windshield sealants on the market by being flexible (to a degree). This means that once cured, it's more adept at withstanding vibrations and changes in temperature.

Pros

  • Proven industry name
  • Small quantity ideal for minor fixes
  • Multiple uses
  • Quick curing for fast repairs
  • Degree of flexibility for long-lasting fixes

Cons

  • Small quantity not ideal for large-scale fixes
  • Not specialized for windshield sealant repair
  • Sealant can leave residue and remnants if removed

Verdict

A great solution for quick relief to tricky leaks. The J-B Weld 31319 RTV Silicone Sealant and Adhesive is ideal for time-sensitive mends. Although not suitable for a complete reseal of a windshield, it's still one of the best temporary sealants on the market, and one that comes highly recommended by those who've used it.

4. Captain Tolley's Creeping Crack Cure

The majority of our products have focused on products to cure leaks that stem from around the windshield seams, but what about cracks on the glass itself? Does a crack on a windscreen automatically mean you need a replacement? Well thanks to Captain Tolley's Creeping Crack Cure, you may have a cheaper and easier solution!

Features & Benefits of Captain Tolley's Creeping Crack Cure

  • Seeks out Cracks: A thin and runny liquid, Captain Tolley's Creeping Crack Cure is designed to get into even the tightest and slightest of cracks. This allows the liquid to cover exactly what it needs to and offers the best solution for those pesky small creeping cracks.
  • Clear FormulaThe clear and transparent windscreen sealant will ensure that repairs are as unnoticeable as possible. Captain Tolley's formula cures to a clear solution, ensuring that outward vision isn't disturbed.
  • An effective sealantStop water from getting inside your car by using the Creeping Crack Cure is an effective windshield sealant. Once cured the solution is both watertight and flexible, meaning it will not only keep the elements at bay, it'll serve as a durable remedy as well.
  • Use anywhereWindscreens are just one area where Captain Tolley's Creeping Crack Cure can be used. It can be used as an effective sealant and adhesive everywhere, from boats and marine applications to at home in the bathroom or even to fix a cracked mug.
  • Great for the cracks you can't seeThanks to the use of "Capillary Action" (the kind of science that trees use to transport groundwater from their roots), the Creeping Crack Cure will actually seek out and draw itself into hairline cracks that may even be invisible to the naked eye.

Pros

  • Great for hairline cracks
  • Can be used in any situation
  • Clear and transparent finish
  • Watertight and weather-resistant finish

Cons

  • A long drying time of 24 hours
  • Liquid consistency can lead to runoff

Verdict

Although different to the other solutions on our list, Captain Tolley's Creeping Crack Cure certainly deserves inclusion in our list of the best windshield sealants. Effective at sealing even the most unnoticeable of cracks, the creeping crack cure could save you thousands of dollars off a replacement windshield.

5. Sikaflex P2G Primerless Adhesive

The Sika Auto Glass Sealant Windshield Urethane Glue Sikaflex is another option for those looking for a total windshield resealing option. A primerless, single-step windshield sealant, it is certainly more geared towards those who may be confident in their ability to refit a windshield DIY.

Features & Benefits of Sikaflex P2G Primerless Adhesive

  • Included applicator Nozzle: Although most reviews found it best to use a caulking gun, the Sika Auto Glass Sealant Windshield Urethane Glue comes with a nozzle. This means it can be used straight from the get-go if you have no tools at hand.
  • Strong Bonding ActionThe SIKA Auto Glass Sealant Windshield Urethane Glue promises to perform well, with a strong bond for all windshield applications. This should allow the sealant to outlast others in the market, providing a firm and dependable bond for your vehicle's windshield.
  • One ComponentSika's windshield adhesive is one component, meaning that it doesn’t require any other substances or mixing to be effective. Simply apply and wait for it to cure.
  • Quick CuringWith a relatively quick curing time, SIKA's Auto Glass Sealant helps you plan out your project timelines effectively. With just 6 hours needed after a complete windshield refitting, SIKA’s product is great for those with limited time.

Pros

  • Relatively short cure time
  • No mixing required
  • Can be used with nozzle or gun
  • Strong bonding

Cons

  • Difficult to apply
  • Residue can be hard to remove if you make a mistake

Verdict

The SIKA Auto Glass Sealant Windshield Urethane Glue Sikaflex is one that may rightly be considered most suited to those with a professional background in auto windshield work. Yet, with a little patience and skill, even DIY-ers should be able to yield favorable results.

6. Permatex 81173 Black Silicone Adhesive Sealant

If you're looking for an all-in-one multipurpose sealant that can be used, not only for windshields and glass, then the Permatex 81173 Black Silicone Adhesive Sealant might be perfect for you.

Features & Benefits of Permatex 81173 Black Silicone Adhesive Sealant

  • Multipurpose: The Permatex 81173 Black Silicone Adhesive Sealant isn't designed for only automotive usage. It's great for a number of applications that require a strong and safe sealant, whether it be an automobile, RV, or even at home.
  • Great ValueThanks to its multifaceted application portfolio. The Permatex 81173 sealant proves to be one of the best value offerings on our list.  As it can be used for a variety of applications it's great for saving money by possibly eliminating the need to spend on multiple products.
  • Not Just for GlassThe Permatex Black Silicone Adhesive Sealant isn't just for windshields and glass. It can be used on a variety of surfaces and for a variety of applications, including seams and roofs, door frames, electrical connections, weather stripping, and vinyl tops.
  • Resistant to the elementsPermatex claims that their Black Silicone Adhesive Sealant is resistant to a range of substances as well as weather conditions. Their sealant can withstand harsh vibrations, temperatures from -75 degrees Fahrenheit to 450 degrees Fahrenheit and will hold off substances such as water, oil, and grease
  • Easy to apply: With the supplied applicator, the Permatex Black Silicone Adhesive Sealant is easy to work with and easy to apply. No special tools or guns are required, as the tube has a built-in dispenser mechanism, and the adhesive stays viscous and easy to mold or shape into cracks and crevices.

Pros

  • Free-flowing composition allows for easy access to crevices
  • Can be removed easily with little-to-no residue
  • Comes supplied with an applicator
  • A variety of uses around vehicles and the home
  • Weather and fluid resistant

Cons

  • Long curing time
  • Not specialized for windshield application
  • No claimed strength tests for windshields

Verdict

Although not the most specialized product on our list, Permatex does claim It's suitable for windscreens. And that, coupled with its many other uses, means that the Permatex Black Silicone Adhesive Sealant earns its place on our list, and very possibly in your garage arsenal.

Things to Consider Before Buying

If you're purchasing a windshield sealant for the first time, you may want to consider a few key points before settling on which sealant you want to use. We’ve listed some of the top considerations below.

Identifying the Problem

If you’re looking for a windshield sealant, the chances are that you’ve already identified what the problem is. But if not, now would be the time to seriously consider what steps need to be taken. For example, if you have a small leak, would it be best fixed by using a quick-fix sealant, or do you need to reseal the entire windscreen? Some of the products we’ve listed are suitable for small jobs, but not the larger ones, and vice versa.

How long do you have?

If you’re using the vehicle extensively, you might not have the luxury of having time on your hands. This is important to consider when looking at the various drying and curing times that come with the sealants. Some may take only a few hours to cure, yet other windshield sealants may need 24 hours.

What color sealant do you need?

One thing that may be overlooked is the color of the sealant applied. When drying, a windshield sealant may start to yellow. Conversely, if you’re doing a quick fix to an outer seal, you’ll want to ensure the colors match (eg: black sealant repair over black window surround).

Methods of Application

Have you wondered what the correct methods of application may be for the sealant? Do you have the tools, such as an applicator gun, that may be required for the correct application? Not all windshield sealants come with their own applicators, so this is something to bear in mind.

Durability 

One of the most important factors to consider if the durability of the sealant you’re applying. Want it to last a lifetime? Or are you expecting it to be a stop-gap until a professional assessment? You need a sealant to be waterproof at the very least, but consider other factors such as resistance to extreme temperatures, and vibration.

Frequently Asked Questions

Why would I need to reseal my windshield?

The most common issue that is seen is water leaking into the cabin. However, there are other common symptoms, including if you notice your windshield lifting slightly at high speeds, or experience increased wind noise entering the cabin.

Do I have to reseal the entire windshield?

Windshield sealant may help to patch and plug leaks that are caused by rusting or corroded areas of metal, but they will not stop the spread or repair this rust. Once it takes hold, rust will continue to form and spread. This may result in further deterioration of your windscreen surround and more leaks in the future. The best way to attend to such a situation is to have the rusted areas cut out, and replaced with new metal. This may not always be viable though.

My carpets are damp, but I can’t see any noticeable leaks from my windscreen!

Damp carpets can be a symptom of many things, including AC leaks, sunroof leaks, and, yes, a leaking windshield. If your carpets are damp this usually means the lower edge of your windshield is leaking, causing water to run down the bulkhead and collect in the footwell. This can be harder to notice and identify.

Can I use a windshield sealant on other areas of my vehicle?

You may be able to use windshield sealant as an adhesive for other fixed glass locations, such as the rear windshield and some lights. Some users have been known to use windshield sealant as a fix-all solution from everything to keeping fenders attached to securing interior trim. Although we wouldn't recommend this, it's worth consulting the manufacturer's instructions about this.

Conclusion

With many options on the market, the six top windshield sealants mentioned here all have what it takes to get the job done. Each of them has been selected due to their potential to deliver outstanding results. Although many of the products listed here are designed for a particular job in mind, they all are outstanding in their class when it comes to their sealant and adhesive abilities.

Leave a Comment