Best Sealant for RV Windows – Leakproof Your RV!

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After you purchase an RV there are a few maintenance related things you’ll need to do to ensure that your RV is in the best condition possible. One of the things you might want to do is apply a sealant to your RV windows.

By applying an RV window sealant you will be protecting your RV from water damage. When there’s a big storm it’s easy for water to get through the cracks in the windows and cause damage to the inside of the RV. Applying a good sealant will fix this issue.

Furthermore, applying RV window sealant will help air from escaping to the outside. This is especially helpful in the winter when you’re trying to stay warm in your RV. Without the sealant, you might find that your RV cools down much cooler than you’d like depending on its insulation. As a result, you will need to expend more power, energy, and as a result, money on keeping your RV warm. By applying RV window sealant you won’t’ have this issue.

Is There a Difference Between Caulk and Sealants?

The big difference between caulk and sealants is flexibility. Caulk is inflexible and stiff after it dries, and therefore it works better in areas with little movement. Sealants are made to be flexible which makes them perfect for areas that shift and move like an RV driving down the road.

With all that in mind, you’ll want to purchase the best RV window sealant you can find. After applying the best sealant available, you’ll have so much less to worry about. After all, you don’t want to spend your trips worrying, you want to spend them having fun.

The 6 Best RV Window Sealants

Here we’ll look at six of the best RV window sealant options available on the market. You should take note that although this is a numbered list, we did not rank the products. The products are listed in no particular order, so you can choose one based on your personal preference.

1. Permatex Windshield and Glass Sealant

When you’re out on the road in your RV, the last thing you want to worry about is water damage. Water damage among the most difficult damage to fix, so avoiding it in the first place is essential. With this sealant, you won’t have to worry about water damage any time soon.

Permatex Windshield and Glass Sealant comes in a 1.5-ounce tube and is very affordable. It’s also incredibly durable, meaning that it can withstand extreme temperatures, and it’s completely waterproof. It can also withstand exposure to strong chemicals.

If you haven’t applied an RV window sealant before you might be worried about the difficulty. Luckily, this sealant is incredibly easy to apply. This is thanks to the “flowability” feature. This feature allows the sealant to enter every crevice, no matter how small it is. Once it’s inside, it won’t get out. This also makes it, so you have a clean finish and don’t have any bumps or dents.

One thing that is very worrisome for people when they apply a sealant for the first time is that it will look ugly on their RV. That won’t be the case with this product as it’s completely clear, even after drying. The product does take 30 minutes to dry which is slower than most products. However, that’s a small price to pay for a quality product.

Another benefit of this product is that it’s multipurpose. In addition to using it for your windows, you can use for sunroofs, headlamps, and other things. Basically, you can use this product for anything you would need a sealant for.

The biggest downside to using this product is that you might need to apply a second coat. However, since it only takes 30 minutes to dry that isn’t a big deal.

2. Gorilla Multipurpose Silicone Sealant

Gorilla Multipurpose Silicone Sealant comes in a 2.8-ounce tube and is one of the cheapest options on the market currently. However, that doesn’t mean that it is lacking in quality. In fact, it is one of the higher quality products available.

This sealant from Gorilla is different from other sealants in one major way. Most sealants also act as an adhesive, whereas Gorilla is made from pure silicone. This means that it isn’t as strong as the adhesive sealants. However, it’s better at filling in the cracks because it’s incredibly flexible and can mold into any shape.

Additionally, silicone makes the sealant tougher and more durable than other products. This makes it so it can withstand extreme weather conditions. Specifically, it holds up very well against water.

Like the previous product, Gorilla is completely transparent when dry, so you don’t need to worry about it making your windows ugly. It takes roughly 30 minutes to dry to the point where it can be exposed to water. However, it doesn’t completely dry for a few hours. Once these few hours pass it will be incredibly strong. As a result, it’s wise to wait to use your RV until it’s completely dry.

You should make sure that you close the lid very tight after using the product. Otherwise, the sealant will dry out incredibly quickly. That would be a huge waster of a tube that could last you a long time.

3. Titan P2G Car Glass Windshield Sealant

Titan P2G Car Glass Windshield Sealant comes in a large 10-ounce tube. It is made with polyurethane, which makes the product incredibly strong. You can use this product for professional windshield replacements. However, it will fix windshield leaks as well. Unfortunately, it isn’t resistant to everything as it can deteriorate from alcohol-based solvents.

To apply this product you need to make sure that it’s room temperature. Applying the product when it’s too hot or too cold could have a negative effect on the sealant. Once you apply the product it will dry pretty quickly because it’s a non-conductive.

Actually applying the sealant can be somewhat difficult. The tube is difficult to handle and will require a strong squeeze. As a result, you need to stay patient when trying to apply the sealant or you’ll get frustrated quickly.

If you’re looking for a product that will fix small and large leaks, this is a great option for you.

4. DOW U-428 Urethane Window Sealant

DOW U-428 Urethane Window Sealant is one of the more expensive options currently on the market. However, that doesn’t mean it isn’t affordable. Even the most expensive sealants are affordable. It also does a lot more than your average window sealant.

With this product you can’t just squeeze it out of the tube to apply it, it requires a little bit more work. However, by taking that extra time to apply it, you’ll get a product that is incredibly tough and durable.

This sealant doesn’t need to be primed, it’s a one-component adhesive. However, applying sealant can still be a little difficult. Since the sealant is so thick, it’s very difficult to squeeze out. As a result, you may want to heat it up so you can squeeze it out easier. The best way to do this is with a caulk gun. However, if you don’t already have one you don’t need to purchase one. Instead, you can soak the tube in hot water for an hour or so and you’ll be good to go. It’s sort of like running jar under hot water to loosen the lid.

5. Versachem Windshield and Glass Sealant

Versachem Windshield and Glass Sealant comes in a 1.5-ounce tube, and it can be used for glass, metal, rubber, wood, and plastic. It’s an incredibly strong adhesive, which makes it a great sealant.

This sealant is very durable like many of the other sealants. It’s waterproof and it can hold up against harsh weather conditions such as extreme temperatures, high pressures, and strong chemicals. Applying this product is very easy as well. All you need to do is squeeze it and it will come right out.

This product also has the “flowability” feature that was part of the Permatex product. As a result, the product is very flexible and will be able to reach even the small and hard to reach holes.

It takes about an hour for the product to dry to the point where you can use the vehicle. However, it’s recommended that you wait 24 hours to ensure that the sealant has dried completely.

6. Eclectic Seal-All Window Sealant

Eclectic Seal-All Window Sealant comes in a 2-ounce tube, and it’s very affordable. It is an incredibly strong adhesive. As a result, it can last a long time, even in extreme weather conditions. It is also waterproof, resistant to abrasion, gas, and oil. Additionally, it is transparent when dried, so you don’t need to worry about having an ugly coating around your windows.

Seal-All is a great option if you want a product that will dry incredibly quickly. This product can dry in less than five minutes. As a result, this product is great for emergency fixes on the side of the road. That being said, the silicone will remain tacky after a few minutes. It will take two to three hours to fully solidify, but you can use your vehicle before then if need be.

Benefits of RV Window Sealants

Now that you have an idea of what the best RV window sealant options are for you, you might be wondering what the benefits are of using a sealant? We outlined it briefly above, but we’ll reiterate it. Sealants are great for protecting your RV from damage. They keep water from getting into your vehicle.

Additionally, window sealants are great for insulating your vehicle. So, when you use your sealant you’ll have an RV that retains heat better. This is especially useful in the winter when all you want to do is stay warm. Warm air can escape through the window cracks, but with a sealant, this won’t happen. This will also save you money long term as you won’t need to spend extra money powering your heater.

How Long Does RV Window Sealant Last?

Unfortunately, there isn’t one answer to this question. There are so many different products available to you and they all will have a different answer. As you might expect cheaper products won’t last as long as the more expensive ones.

However, you still need to know how long the sealant will last, so you can know when it needs to be reapplied. As a result, you should get that information from someone at the store when you’re purchasing it. They will likely have that information for you. You can also find information on the specific product online with a quick google search. It’s better to do a little research beforehand so you’re prepared for the future.

How to Apply an RV Window Sealant

The first thing you need to do is find the source of the leak. It may be obvious, but in a lot of situations, it will be hard to find. If it’s hard to find, spray some water on the window to try to find where it’s entering your RV.

Next, you should protect the glass and car paint with tape. The last thing you want is for the sealant to do damage to the paint of your car. After preparing your vehicle you can prepare the sealant by opening the lid and cutting the tip to be as small as possible. If you need to heat up the sealant, this would be the time to do so.

You can then apply the sealant by placing the tip of the tube into the leaking hole and squeezing the sealant out until the hole is filled. Once you’re done, smooth it out with your finger. You can then let it dry for the designated time. Once it’s done drying, remove the tape and any excess sealant. After you’ve removed the tape you will ideally let it dry more overnight. However, if this isn’t possible then you can start driving.

What’s the Best RV Window Sealant for You?

After reading, we hope you’re a little closer to finding the best RV window sealant for you. We know there are a lot of options to choose from and a lot of information to absorb, but we hope you found this article useful.

We wish we could tell you what the best RV window sealant is, but we can’t. Everyone has different needs, and for us to claim that we know what yours are would be irresponsible. However, we can say with confidence that all the products listed above are good options.

Have you used an RV window sealant before? What product do you think you’re going to purchase? Let us know in the comments!

Related Reading:

Do RV Window Rain Guards Really Keep Rain Out?

RV Window Tinting – Increase Privacy and Reduce Heat

RV Window Insulation Tips for Summer and Winter

Mike Scarpignato – Bio

Mike Scarpignato created over five years ago in 2018 to share all we have learned about RV camping.

Mike is an avid outdoorsman with decades of experience tent camping and traveling in his 2008 Gulf Stream Conquest Class C RV and 2021 Thor Challenger Class A motorhome.

We attend RV Shows and visit RV dealerships all across the country to tour and review drivable motorhomes and towable trailers to provide the best evaluations of these RVs in our blog articles and YouTube videos.

We are 3/4-time RVers who created to provide helpful information about all kinds of RVs and related products, gear, camping memberships, tips, hacks and advice.

Mike and Susan from RVBlogger at an RV Show touring reviewing and rating RVs

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1 thought on “Best Sealant for RV Windows – Leakproof Your RV!”

  1. I disagree with using flowable glass sealant. It’s no good for doing the outside edges or the underside becouse it is too runny. Regular shower glass sealant works better


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