9 Best RV Window Sealant & Features 2023

This post may contain affiliate links and we may earn a small commission when you click on the links at no extra cost to you. As an amazon affiliate, we earn from qualifying purchases.   Learn more from the privacy policy page

Being an RV owner requires you to be knowledgeable on how to use the best RV Window sealant. RV windows are excellent for letting in light and giving your vehicle a sense of spaciousness and airiness. When you open them, they’ll let in some fresh air. All RVers hate drafty windows, so it’s critical to use the best RV window sealant available.

There are numerous sealants and caulking products on the market, and the majority of them will work well. However, some stand out above others. Take a look at our top recommendation, as well as a couple of excellent runner-ups, below.

9 Best RV Window Sealant & Features 2023

When it comes to keeping the elements out, RV windows are one of its most vulnerable spots. They’re a soft, see-out point that can be easily damaged by the elements. An RV window seal is the best way to keep the elements at bay and make sure they’re not able to get in.

Agree? Then you know the importance of investing in a quality seal. Luckily, there’s a wide range of sealants on the market that offer great protection. With that in mind, we’ve rounded up the top 9 RV window sealants you can choose from today.

1. Permatex 81730 Flowable Silicone Windshield and Glass Sealer
9 Best RV Window Sealant & Features 2023

Permatex 81730 Flowable Silicone Windshield and Glass Sealer

Permatex forms a tough, waterproof, durable, clear seal resistant to weather, extreme temperatures, vibration, and shock.

Water damage is the last thing on your mind when traveling in your RV. Water damage is one of the most difficult types of damage to repair, so prevention is always preferable to cure. Thanks to this sealer, you’ll never have to worry about water damage again.

One tube of Permatex Windshield & Glass Sealant costs only $1.50. It’s also highly tough and waterproof, so you may use it in any environment. It can also tolerate exposure to corrosive acids and solvents.

If this is your first time applying RV window sealant, you may be concerned about the difficulty. This sealer is a breeze to use. The “flowability” characteristic is to thank you for it. The sealant can get into even the tiniest cracks and crevices with this characteristic. Your car will be smooth and free of dings and dings when you get inside.

When applying a sealant for the first time, many individuals are concerned that it would make their RV seem unattractive. Because this product is entirely clear even after drying, it will not have this issue. It takes 30 minutes for the product to dry, which is longer than most. In the end, it’s a modest price to pay for such a high-quality item.

This product has the added benefit of being versatile. You can also use it for sunroofs, lights, and other applications. This product can be used for any application where a sealant is required.

You may need to apply a second layer of this product. However, drying time isn’t an issue because it only takes 30 minutes.

Highlighted Features:

  • Waterproof
  • Durable
  • Resistant to weather

2. Gorilla Multipurpose Silicone Sealant
9 Best RV Window Sealant & Features 2023

Gorilla Multipurpose Silicone Sealant

Gorilla silicone sealant is ready for water exposure in just 30 minutes, and this waterproof sealant is mould & mildew-resistant.

There are several silicone sealants today, but Gorilla Multipurpose Silicone Sealant is one of the most cost-effective at 2.8 ounces. Despite this, the product nevertheless has a high level of quality. It’s up there with the best of the best.

Gorilla’s sealant differs significantly from other sealants in this regard. In contrast to other sealants, Gorilla is manufactured entirely of silicone. The adhesive sealants are stronger. Therefore this isn’t a good substitute. Flexibility and ability to adapt to any shape make it excellent at filling in the gaps.

In addition, silicone increases the sealant’s tensile strength and durability over competing materials. As a result, it can resist even the harshest weather. It is particularly resistant to water.

Gorilla, like its predecessor, dries transparently, so you don’t have to be concerned about it making your windows seem bad. It has to dry for around 30 minutes before it can be submerged in water. A few hours later, it’s still not dry. It will get a lot more powerful in the next few hours. Waiting for your RV to dry completely is a sensible decision.

After using the product, check sure the lid is tightly closed. The sealant will dry out very fast if this is not the case. An expensive, long-lasting tube would be squandered in such an absurd manner.

Highlighted Features:

  • Waterproof
  • Won’t yellow over time 
  • Mould & mildew resistant

3. Dicor 501LSW Self-Leveling Lap Sealant
9 Best RV Window Sealant & Features 2023

Dicor 501LSW Self-Leveling Lap Sealant

Dicor assists in forming a seal around the margins of a roof, around air vents, vent pipes, and screw heads.

Because this RV roof sealant from Dicor is self-levelling, you don’t have to get your hands dirty while applying it to RV roofs. Pumping out the Dicor lap sealant is a breeze. It also has the consistency of somewhat runny toothpaste, so it is so easy to level on the surface.

The Dicor RV caulk can be used as a secondary sealant; however, it is not recommended as the primary sealer. You can use this RV trim sealant over the existing caulking to ensure that your RV’s roof is entirely watertight. Your vehicle’s lifespan will increase as moisture can’t get inside.

This sealer is capable of adhering to a wide range of RV materials. Even if your car has an EPDM rubber roof, it will stick well. Even galvanized metals can be treated with this product.

This RV caulking product also benefits from not hardening after application to remain flexible for some time after use. Because of its incredible flexibility, it can be used on seams that are frequently subjected to jolting.

Highlighted Features:

  • Compatible with any type of roofing material
  • offers excellent adhesion 
  • Flexible seal
  • UV stabilized 

4. 3M Marine Adhesive Sealant 4000 UV
9 Best RV Window Sealant & Features 2023

3M Marine Adhesive Sealant 4000 UV

This sensitive surface tape with a mild adhesive adheres for up to 60 days and then easily peels away without leaving any sticky residue.

3M’s marine caulk is an excellent option if you’re looking for an RV caulk with superior UV protection. It has a medium-strength bond and is easy to disassemble, but it also has excellent waterproofing properties.

This silane-modified polymer can be used on aluminium, gel coat, wood, and fibreglass, and it will completely seal against the weather. Unlike many other sealants, this one can be painted right after application for a harmonious finish.

This elastomeric sealant is designed to withstand the vibrations, swelling, and shrinking of your RV’s exterior. Your sealant will not be destroyed due to exposure to UV rays, temperature changes, and other elements of nature, such as driving.

No other product has a better waterproof seal with such great UV resistance. This sealer is good for most RV exteriors because it can withstand vibrations, traffic, and temperature thanks to its strong, rubbery seal and great durability. However, it costs a lot more than most other options out there.

Applying the product might also be challenging, especially for first-time users. Caulk can be tricky to deal with at first, but with a little expertise, you should be able to remove it with ease for reworking or seam repairs.

Highlighted Features:

  • Waterproof
  • Sensitive
  • Flexible
  • Superior UV resistant
  • Edge-lock technology

5. ToughGrade Self-Leveling RV Lap Sealant
9 Best RV Window Sealant & Features 2023

ToughGrade Self-Leveling RV Lap Sealant

ToughGrade is a quality RV caulk for sealing your rubber roof seams.

This four-pack of ToughGrade’s Self-Leveling RV Lap Sealant is a simple and easy-to-use option for resealing your entire motorhome roof. This well-known sealer, which is ideal for rubber roofs on RVs, is also suitable for use on most other types of roofs.

Many different materials can be joined together with the help of this adhesive. Examples of these include aluminium, galvanized steel, vinyl and wood. As an alternative to sealing your EPDM roof, you may also use it to cover your vents and pipes or the screw heads on your air conditioners. This sealant’s self-levelling composition makes it easier to apply and better weather protection.

Protects against the sun’s harmful rays. This keeps it from yellowing and splitting in the sun, ensuring that your RV is safe and well-protected. This also aids in the sealant’s ability to maintain its flexibility and provide a long-lasting seal.

With a regular caulk gun, this RV sealer is easy to apply. Some other products, on the other hand, are easier to level. So, you may need to use a putty knife to help spread it out a bit.

Highlighted Features:

  • UV stabilized resistant
  • Premium adhesive
  • Universal compatibility

9 Best RV Window Sealant & Features 2023


With enhanced adhesion, maximum flexibility, and superior sheer stress resistance, the XFasten silicone sealant will not shrink or split even when exposed to freezing conditions for an extended time.

The Xfasten silicone sealer is a fantastic choice when it comes to sealants. Both your RV and your house can be sealed with this sealant. An industrial-strength caulk that can withstand temperatures as low as -40 degrees Fahrenheit is what you’ll find here.

It can be applied to virtually any surface. Metal, granite, stone, and wood are just a few materials that fall under this category. Up to 15 years of protection can be expected from this product. It doesn’t shrink or crack, and it sets up rapidly.

When shopping for a caulk, keep in mind the colour of the caulk you want to use. The only colour available for this sealant is black. The hue of other adhesives might range from white to tan to grey or even clear.

Highlighted Features:

  • Industrial grade waterproofing
  • Easy to use
  • Thick and flexible
  • High-pressure resistant cartridge

7. Liquid Rubber Leak Repair Sealant for RVs 
9 Best RV Window Sealant & Features 2023

Liquid Rubber Leak Repair Sealant for RVs 

Once cured, Liquid Rubber Waterproof Sealant demonstrates exceptional flexibility. With an elongation of over 1000 per cent, you never have to worry about minor movement undoing all your hard work.

You can use a liquid rubber multi-surface leak repair sealer to cover a greater area if you wish to seal the roof. The long-lasting sealer is used to guard against leaks and protect vulnerable places such as air ducts, skylights, vents, roof edges, and vent pipes.

If you’re unsure where the leak is but still want to seal the area in question, this is a fantastic option.

Remember that even though this sealant is referred to as liquid rubber, it can degrade over time due to exposure to sunshine and other environmental factors. As a result, you will have to renew regularly. To determine how often to do this, consider how much sun and additional outdoor exposure you get.

As the last point, keep your camper covered or in a garage when it is not used to preserve its life and avoid problems.

Highlighted Features:

  • Flexible 
  • Durable
  • Environmental friendly
  • Waterproof
  • Easy to use

8. Versachem 75009 Flowable Windshield Silicone
9 Best RV Window Sealant & Features 2023

Versachem 75009 Flowable Windshield Silicone

Versachem Flowable Silicone is a solvent-free silicone that flows into cracks and seams to form a transparent, durable, flexible, and airtight seal.

For use on glass, metal, rubber, wood, and plastic, Versachem Windshield and Glass Sealant are available in a 1.5-ounce tube with various applications. It’s a fantastic sealer because it’s such a strong adhesive.

Like many other sealants, this sealant is extremely long-lasting. It’s impervious to water. It’s also easy to apply.

The “flowability” attribute of the Permatex product is also included in this one. As a result, the product is extremely flexible and can reach even the tiniest and most difficult-to-reach areas.

Using the car is possible after the product has dried for an hour. Waiting for the sealant to dry completely for at least 24 hours is often advised.

Highlighted Features:

  • Resistant to weather 
  • Vibration absorption
  • Flexible
  • Waterproof
  • Works on glass, wood, metal, rubber, etc. 

9. Sashco 13010 Sashco Sealants Clear Lexel Adhesive Caulk
9 Best RV Window Sealant & Features 2023

Sashco 13010 Sashco Sealants Clear Lexel Adhesive Caulk

Lexel is the ideal weapon; it is an indoor/outdoor sealer that adheres to challenging surfaces and blends in with anything.

This Lexel RV caulk is also extremely durable, as evidenced by the many households that employ it. If you’re looking for a tear-resistant sealant, this is one of the best options available. It’s not only stain-resistant, but it’s also crack-resistant.

It’s mould-resistant and water-resistant. No mould or mildew will form on this sealer. The caulk is constructed of components that prevent them. Camping is beneficial and healthful.

Avoid applying this product inside as well. Make sure no one is inside the RV when you utilize it for indoor uses if you require it. Make sure to open all of the windows and doors to get rid of the scent. As a result, the odour will not remain.

Highlighted Features:

  • Waterproof
  • Flexible
  • Paintability
  • Freeze-thaw stability

Features Of The Best Sealant 

Here are some key features to look for when selecting a sealant or caulk:

  • Adhesion: A good sealant or caulk should have strong adhesion properties, allowing it to adhere firmly to the surface it is applied to. This ensures that it will not peel or come loose over time.

  • Durability: A high-quality sealant or caulk should be able to withstand extreme temperatures, UV exposure, and other harsh conditions. It should also be resistant to shrinkage and cracking, ensuring that it stays in place and maintains its seal over time.

  • Flexibility: A good sealant or caulk should be able to stretch and flex as the materials it is sealing expand and contract. This ensures that it will not crack or become damaged due to movement.

  • Water resistance: A sealant or caulk that is resistant to water is essential for preventing leaks and moisture infiltration.

  • Ease of use: Look for a sealant or caulk that is easy to apply, with a smooth and consistent consistency. It should also be easy to clean up, with minimal mess and fuss.

  • Versatility: A sealant or caulk that can be used on a variety of surfaces and materials is ideal, as it will allow you to use it for a wide range of sealing and caulking tasks.

  • Compatibility: Make sure to choose a sealant or caulk that is compatible with the materials you are working with. Some sealants or caulks may not work well with certain types of materials, such as certain plastics or rubbers.

  • Color options: If the sealant or caulk will be visible after application, consider choosing a product that is available in a range of colors to match the surrounding materials.

  • Size: Consider the size of the sealant or caulk tube, as well as the amount of sealant or caulk that is needed for your project. Some products may be more cost-effective for larger jobs, while others may be more suitable for smaller tasks.

What Sealant Should I Use On My RV?

There are several types of sealants that can be used on an RV, and the best one for your needs will depend on the type of material you are sealing and the specific requirements of the repair. Here are some common types of sealants that can be used on an RV:

  1. Silicone sealant: Silicone sealant is a popular choice for sealing around windows and doors, as it is highly durable and waterproof. It is also resistant to temperature extremes and UV light, making it suitable for outdoor use. However, silicone sealant may not adhere well to certain surfaces, such as certain types of plastic or painted surfaces.
  2. Polyurethane sealant: Polyurethane sealant is a strong and flexible adhesive that is ideal for filling gaps and sealing joints. It is resistant to water, UV light, and temperature extremes, making it suitable for outdoor use. Polyurethane sealant can be painted over once it is dry, making it a good choice for cosmetic repairs.
  3. Acrylic sealant: Acrylic sealant is a less durable option, but it is easier to work with and can be painted over once dry. It is ideal for filling small gaps and sealing joints, and it is resistant to water and UV light. Acrylic sealant is not as resistant to temperature extremes as silicone or polyurethane, so it may not be the best choice for outdoor use in extreme conditions.

When selecting a sealant for your RV, be sure to consider the specific requirements of the repair, such as the type of material being sealed and the exposure to weather and UV light. You should also consider the drying time and the ease of use of the sealant, as well as any special instructions or precautions provided by the manufacturer.

What Are The Benefits of Using The Best RV Sealant?

There are several benefits to using the best RV sealant, including:

  1. Improved durability: A high-quality sealant can help to protect your RV from water damage, UV rays, and other elements that can cause wear and tear over time.
  2. Enhanced energy efficiency: By sealing up any gaps or cracks in your RV, you can help to keep the interior temperature more consistent, which can reduce your need for heating and cooling.
  3. Increased resale value: A well-maintained RV is more likely to fetch a higher price when it comes time to sell. Using a durable sealant can help to keep your RV in top condition, which can increase its resale value.
  4. Enhanced comfort: A properly sealed RV will be more comfortable to use, as it will be better insulated and less prone to drafts.
  5. Reduced maintenance: By using a high-quality sealant, you can reduce the need for ongoing maintenance and repairs to your RV. This can save you time and money in the long run.
  6. Improved appearance: A well-sealed RV will have a more polished, professional appearance, which can enhance your overall enjoyment of the vehicle.

How To Repair Cracked RV Windows & Doors Using Sealants

Repairing a cracked RV window or door can be done using sealants, which are adhesive materials that can fill gaps and prevent water and air from entering. Here is a step-by-step guide on how to repair a cracked RV window or door using sealants:

  1. Clean the area around the crack: Use a soft cloth or brush to remove any dirt or debris from the area around the crack. This will ensure that the sealant adheres properly to the surface.
  2. Mask off the area: Use masking tape or painter’s tape to create a border around the crack. This will help to keep the sealant contained and make it easier to apply a smooth and even layer.
  3. Choose a sealant: There are several types of sealants that can be used to repair a cracked RV window or door, including silicone, polyurethane, and acrylic. Silicone is the most durable and waterproof, but it may not adhere well to certain surfaces. Polyurethane and acrylic sealants are less durable but may be easier to work with and can be painted over once dry.
  4. Cut the tip of the sealant tube: Use a utility knife or scissors to cut the tip of the sealant tube at a 45-degree angle to match the width of the crack.
  5. Apply the sealant: Starting at one end of the crack, slowly squeeze the sealant into the gap, filling it completely. Use a scraper or putty knife to smooth and level the sealant, making sure to remove any excess.
  6. Allow the sealant to dry: Follow the manufacturer’s instructions for drying time, as this can vary depending on the type of sealant used.
  7. Remove the masking tape: Once the sealant is dry, carefully remove the masking tape. If there are any uneven or rough areas, use fine-grit sandpaper to smooth them out.
  8. Paint the repaired area: If desired, you can paint the repaired area to match the surrounding surface. Use high-quality exterior paint and follow the manufacturer’s instructions for drying time.

By following these steps, you can effectively repair a cracked RV window or door using sealants, helping to prevent water and air from entering and preserving the integrity of your vehicle.


Getting the best RV window sealant is not a problem if you know what you want. So, with our list above, you shouldn’t face any challenges.

Remember that liquid rubber roof sealant or sealant tape is your best bet if you cover larger areas or aren’t sure where the leak is coming from. To establish a long-lasting seal, caulk should be applied around the edges of the sealant tape.

Leave a Comment