Best Caulk for RV Exterior

High-quality caulk is an absolute must-buy for anyone that wants to keep water and other issues from coming inside their RV. Fortunately, the best caulk for RV exteriors, Gray Tremco Vulkem 116 Polyurethane Sealant, works great outdoors. We’ll show you many of the different caulks that you should think about buying when you’re attempting to keep your RV sealed.

Gray Tremco Vulkem 116 Polyurethane Sealant

The best caulk RV for exteriors is certainly the Gray Tremco Vulkem sealant that we’ve listed here. It’s a tremendous product that is very strong for a variety of different uses. One thing that all the customers notice right away is that it’s a fairly inexpensive product. For the price of a regular tube of caulk, you’ll have the opportunity to get an item that will work on just about every exterior piece of your RV that you could want.

This product is not only strong as a sealant, but it also will provide high levels of protection against UV light that degrades many sealants. Another thing that customers liked is that it is a product that’s very effective at being flexible as well as strong. This is a good item to keep around for multiple purposes.

Sashco Clear Lexel Adhesive Caulk

Sashco Clear Lexel Caulk is a good caulk for use inside and outside of your RV and it goes on clear, so it’s something that most people can find a use for without worrying about making an unsightly mistake. This product is very inexpensive, too, so it’s affordable for anyone with an RV. The item is unique in the sense that it can be used on wet surfaces.

Thus, it’s the caulk you want to grab when you have an emergency happening in the form of a leak. This product is paintable, unlike silicone. So, if you’re trying to make your RV look very nice, then it's a good idea to use this sealant and then work on getting the paint finished. Also, this product has a wide variety of uses, so it’s perfect to keep around in case you need it for another sealant job around the RV.  

Dicor 502-LSW Self-Leveling Lap Sealant

The one thing that some people don’t like about this product is the price. You’ll see that it’s a fair bit more expensive than others, but don’t worry about that. It comes in a pack of four so you’re actually saving money by using this item. Another benefit of using this item is that it’s made to be used on EPDM along with many other surfaces, so it’s going to bind to any place on the exterior of your RV.

Fortunately, this is a self-leveling item so you can feel perfectly content using it on a horizontal surface. It’s not going to stain any of the products that it adheres to, either. This item is incredible for its power as well as the UV protection that it offers. All in all, this is a very effective item that anyone would be glad to utilize.

Sashco 10016 Big Stretch Caulk

The Sashco Big Stretch Caulk might not be the first item you think of reaching for when it comes to doing your RV exterior. However, the fact remains that it’s a great item for your RV. The biggest reason most people grab this is the extremely low price. However, it can be hard to find outside of a big case.

Still, this is a product that comes out white and has great flexibility and durability, making it good for some of those places that are hard to get to on your RV, like around the awning. This will last for years in most cases and it’s very resistant to UV effects.

3M Marine Adhesive Sealant 4000 UV, PN06580

The 3M name is famous in sealants, and it’s made this list for all the right reasons. Now, this is an expensive product relative to all the others on the list, but it’s still affordable. It has a medium bonding strength, but it’s very good for UV resistance and sealing with stable color. 

This product is made to be used around water- it’s a marine-grade adhesive that can be used below water for sealing. In other words, this is the stuff you want anywhere it can rain. It only needs 20 minutes to dry and it is resistant to water, movement stress, and still capable of being removed if needed. All in all, it’s a good entry onto this list.

Geocel 28127V Pro Flex Bright White RV Flexible Sealant

Geocel is another brand that many people recognize for its incredible abilities to operate as an RV sealant. This one was designed with the needs of an RV user in mind. This is an inexpensive product, but still middling as far as the price on this list.

The sealant is so strong that it can be exposed to harsh weather right after application. It’s a great item to have in an emergency. It can be applied to places that are wet and oily, even. This will resist dirt and UV light while offering a strong, but flexible hold. You can even paint over it, so that gives it a little bit of extra consideration on our list.


The right sealant can be the difference between a great application and water inside the RV. That’s why you should see which one works best for your circumstances and offers you the outcomes you desire. With all these items as potential purchases, you can’t go wrong.