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What Is The Best RV Window Sealant?

close up of window on a rainy day before applying the best RV window sealant

What Is The Best RV Window Sealant?

RV windows are great for letting in light and making your vehicle feel more open and airy. They can also let in a nice breeze when you crack them open! However, drafty windows are the bane of all RVers, so it’s important to use the best RV window sealant available.

There are lots of different sealants and caulking products on the market and many of them will do a fine job. However, there are some that stand out above the others. Check out our top recommendation below as well as a few great runner-ups.

Overall Best RV Window Sealant: Permatex Windshield and Glass Sealer

If you’re looking for the best RV window sealant, look no further than Permatex! This sealant comes in a 1.5 oz bottle, which might not seem like much at first. However, a little bit goes a long way when you’re using a product like this.

This sealant forms a waterproof seal and it dries clear. This is great because it matches a variety of decoration styles and your repair efforts won’t stick out. The Permatex windshield and glass sealer is ideal for RV owners because once the seal has formed, it is resistant to vibrations, shock, temperature changes, and most shop chemicals.

You can pretty much treat your camper the same way you usually would and you won’t have to worry about the seal coming loose. The liquid format of this sealant is helpful because it can flow into cracks and imperfections that might be hard to reach. Once it dries it will form a durable, flexible seal that can withstand the wear and tear of a life on the road.

Over 1,500 customers have given this product a 5/5 rating. It has consistently performed well, and buyers have commented that it is easy to use and works well for their needs.

If you’re interested in buying some Permatex Windshield and Glass Sealer, you can view additional product details and purchasing options at the Amazon product page.

Honorable Mentions

Geocel 28100V Pro Flex Crystal Clear RV Flexible Sealant

This sealant comes in a 10 oz container, so it can cover large areas. Each tube can last for a long time because you’ll only need to use a little bit at a time to use this sealant effectively. This product can also adhere to many different surfaces, including glass.

Even if the surface is a bit wet, the Geocel flexible sealant will still work. This product is also mildew resistant and can be applied multiple times because it builds upon itself. It also dries clear, so your view out the window won’t be blocked or smeared by anything. You can view more product details and/or buy it here.

Permatex 85913 Clear RTV Silicone Adhesive Sealant

This sealant is another great option from the Permatex brand! If you like the perks of the windshield and glass sealer that we described above, you’ll enjoy this one as well. It comes in a 7.25 oz container, so you get more sealant per bottle with this product.

This sealant works with glass, metal, plastics, fabric, and vinyl, so it’s perfect for RVs of any construction. You can use it for just about anything you need to fix. It’s also resistant to damage done by oil, water, vibration, grease, and various types of weather.

It can tolerate temperatures between -75 degrees Fahrenheit and 400 degrees Fahrenheit, so you never need to worry about going beyond what it can handle! You can view more product details and/or buy it here.

Gorilla 8090001 Squeeze Tube Clear Silicone Sealant

If you’ve ever used Gorilla glue, you’re familiar with the quality that this brand offers. Although this Gorilla sealant is one of the cheapest options on the list, it could still be considered to be the best RV window sealant by some metrics. It comes in a 2.8 oz tube and dries clear once it’s been applied. The product description guarantees that it is 100% waterproof and won’t crack or shrink over time.

This Gorilla sealant works well for windows of all descriptions and is even suitable for boats and other marine vehicles. Customers have been pleased with the value and performance of this product. You can view more product details and/or buy it here.

Versachem 75009 Flowable Windshield Silicone

This sealant from Versachem is similar to the Permatex product we recommended above. It also comes in a small 1.5 oz container and can withstand the chemical and physical hardships that RV windows face. It takes approximately 24 hours for this sealant to cure, but once it does, it’s here to stay.

The Versachem silicone sealant flows into cracks easily and the seal is resistant to vibrations, many types of chemical damage, and various weather conditions.

This sealant is designed to be used on glass, and the product page recommends that it is suitable for windshield repair, sunroofs, headlamps, and other vehicle parts that incorporate glass. You can view more product details and/or buy it here.

Eclectic Products Seal-All Adhesive

Finally, we have the Eclectic Seal-All Adhesive. This is a plastic-based sealant that comes in a 2 oz container. The seal it creates is totally waterproof and won’t weaken even if it’s completely submerged in water. It also sets up incredibly fast! In most circumstances, it only takes 2-3 minutes for the adhesive to dry and set.

It’s also resistant to physical abrasions and temperature changes. You can rest assured that your RV windows can withstand all sorts of strain when you use this sealant on them. You can view more product details here.

Sealant vs caulk

When you’re searching for the best RV window sealant, you might find recommendations for caulking products. It’s easy to confuse these two products, but they are not the same.

Caulk and sealant perform similar roles in an RV, but they are a bit different in their composition. Caulks tend to be more stiff and solid once they dry, whereas sealants are more flexible. Caulk is fantastic for sealing up small holes or cracks in an RV, while sealants are usually the go-to product for windows and doors.

These areas require more flexible seals because of how much movement they experience. However, if you need something sturdy to fill in the holes, a nice caulking product is good to keep on hand as well.


Make sure you keep track of all your RV maintenance and repairs with an online tool such as RV LIFE Maintenance. Not only can you keep all of your documents in one place, but you’ll also receive timely reminders when maintenance is due to help you avoid costly repairs and potentially serious accidents.

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