Best RV Caulks – Secures Gaps and Holes for Longer Times

Were you on your way to having the road trip of your life your leaky RV keeps putting your camping dream ON HOLD?

If there are huge gaps and holes on your RV that you are ever-so-desperate to fill in, you want to use the strongest sealant to remedy these problems!

Don’t worry because we’ll help you get you back on the road in no time once you find the best RV caulk!

The 12 Best RV Caulk Reviews

1 – Pro Flex Super Flexible Elastomeric Sealant (BEST OVERALL)

This is Geocel’s acrylic caulk that claims to have a 50-year lasting power. The best possible RV caulk for RV owners!

A super flexible acrylic caulk that can stick and adhere to different surfaces like damp and slightly oily ones. It’s ideal for metal roof edges, thanks to its very tough texture.

It’s also capable of self-leveling without any mess! After you leave it to level, it’ll look BRAND NEW!

Now, don’t worry because it’s also resealable and paintable. In addition, it is specially formulated and made as a caulk for RV exterior, although you can also apply it on interior surfaces.

Geocel designed it to effectively keep your RV leak-free with ONLY one application. You may have to let it cure for around one to two months, but the final finish is definitely worth it.

What Are the Drawbacks?

If there’s anything to watch out for about this product, it would be its odor. It has a powerful stench that could make your head hurt.

If you do it indoors, the smell might stick to the room and linger. But that’s only a small thing compared to its sealing capability!

Pros

• Super flexible
• 50-year lasting power
• Paintable & Resealable
• Self-leveling

Cons

• Extreme odor
• Cure time takes 1-2 months

2 – Butyl Putty Tape (BEST VALUE)

A completely different product but for the same purpose, the Butyl Putty Tape!

This is one of the best RV caulk products we found for its ultimate flexibility and versatility on many types of surfaces.

Even if it is your first time RV caulking, you won’t have difficulty applying it. A sealant tape can be molded to any shape you require with ZERO HASSLE!

What about its applications? Can you use it for several jobs?

Yes! You can use it for sealing the following items…

• RV roofs and their edges
• Around air conditioners
• Venting systems
• Sidings
• Flanges
• Seals
• Caulk for RV exterior and interior

A sealant tape can work well in all types of weather conditions, yes you name it! It also works even in hot and cold environments.

And guess what? This sealant tape lasts longer than other types of RV sealant tapes on the market! It won’t crack even with long exposure to harsh outdoor elements, including snow and UV rays.

What Are the Drawbacks?

This product is costly BUT non-hardening, so it won’t be hard to remove when you have to re-apply it.

Given its price, you get a lot of value for it. If it fits your budget, and you’re looking for a versatile RV caulk to use, this is it!

Pros

• Can mold into any shape
• Long-lasting
• Can endure long heat exposure and harsh outdoor elements
• Non-hardening

Cons

• Costly

3 – Gorilla Silicone Sealant Caulk (BEST BUDGET PICK)

Now, hold on! It’s not a real gorilla.

Rather, it’s only guaranteed to be one of the best silicone caulks on the market!

Allow us to convince you why this “Gorilla” made it to our list of the best RV caulk options:

• For one, it is a clear silicone sealant, which means fewer to none visible patches on your RV roof, air conditioners, vent pipes, and other RV materials.
• It’s UV resistant and easy to apply. There are RV sealants that take up an entire day to dry up. This product only takes 30 minutes!
• You don’t have to worry about any leaks again because the translucent clear sealant is best to use for sealing cracks and gaps on many surfaces without re-sealing!

The Gorilla Silicone Sealant is capable of so many things that it may even be longer than your grocery list!

You can rely on it for a watertight seal, indoor and outdoors, doors, RV windows, RV roof, gutters, and bath.

This silicone caulk gives you peace of mind because it does not shrink nor turn yellow and is mold and mildew growth resistant.

Most of all, it’s budget-friendly and will not develop any cracks even after a year or two.

What Are the Drawbacks?

This sounds nitpicky, but the product can be too shiny and prone to chalking. However, it will remain quite pliable for many months, making it ideal for use on RVs.

Pros

• No visible patches
• 30 minutes cure time
• No resealing needed
• Usable for indoor and outdoor
• Waterproof seal
• Mold and mildew growth resistant
• Budget-friendly

Cons

• Prone to chalking
• Too shiny

4 – ToughGrade Self-Leveling RV Lap Sealant

ToughGrade is a tough grade product indeed!

This self-leveling RV lap sealant is worth your time. All you have to do is check out its sturdy construction and effective performance.

If you’re an RV owner who wants to reseal or seal their RV roof, RV windows, vent covers, pipes, and screw heads, this fits your needs like a glove!

You can use ToughGrade self-leveling lap sealant to bond aluminum, galvanized metal, vinyl, wood, mortar, and concrete.

This RV caulk is UV stabilized, so it can withstand strong UV rays and heat WITHOUT distorting.

Its formula also ensures that the sealant covers the entire seam and enhanced weather protection.

There’s so much ease when you apply and reapply this RV caulk. You can use it with any standard caulk gun.

What Are the Drawbacks?

It might be a self-leveling lap sealant, but its tough nature doesn’t really level itself that well.

You won’t have to worry about discoloration, but we want to give you a heads up that it does not work well on rubber roofs.

Thankfully, it still seals cracks and sticks parts together!

Pros

• UV stabilized
• Easy to apply and reapply
• Usable on vent covers, pipes, screw heads
• Low risk of discoloration
• Self-leveling formula

Cons

• A bit pricey because it comes in bulks
• Does not work well on rubber

5 – 3M Marine Adhesive Sealant 4000 UV

Are you eyeing for an RV caulk with empire state high levels of UV resistance? The 3M Marine adhesive sealant will end your search at an INSTANT!

This marine-grade RV trim sealant is originally intended for aquatic vehicles. However, it is ALSO usable on different motorhomes.

Speaking of marines, this RV caulk’s water-resistant properties are also resilient to mold and mildew growth.

Versatility is its calling card because you can use it on aluminum, gel coat, wood, and fiberglass.

This silane-modified polymer is ideal for use in harsh, extreme weather and climate conditions and will fully seal against the elements.

We wouldn’t want to wait so long for the RV sealant to dry up. Luckily, the 3M Marine adhesive sealant’s 24-hour cure time adds up to its convenience.

What Are the Drawbacks?

Don’t get us wrong!

It’s a REALLY GOOD sealant, but you can’t appear to use them on holes. So if you intend to cover up holes, we wouldn’t suggest this.

Another drawback is the product shrinks pretty fast. However, this is NOT really a major issue because it still retains the strong and flexible bond.

It is slightly expensive than others, so you may want to look at other options if you’re running on a tight budget.

Pros

• Usable for aquatic vehicles
• Usable on any material, surface, element
• Can withstand harsh conditions & weather
• Resilient to mold & mildew growth
• High durability
• Cure time within 24 hours

Cons

• Slightly expensive
• Shrinks
• Unable to seal holes

6 – Dicor 501LSW Self Leveling Lap Sealant

This Dicor Self Leveling Lap Sealant’s out-of-this-world features are UNMATCHED!

First off, it’s a watertight seal solution that prevents any water damage from leaks. It’ll also make sure this self-leveling RV lap sealant can hold up reasonably well during rainstorms or blizzards.

It’s an RV roof sealant that’s self-leveling, but you have to move quickly when applying it because the nozzle can be weak and could bend.

You’ll also be glad to know that this Dicor lap sealant is UV resistant which does not deteriorate no matter how often you use your RV.

This Dicor RV roof caulk sticks onto any material because it comes with a strong adhesion level that makes it long-lasting!

This Dicor sealant is obviously amazing at sealing your RV roof. It acts like runny toothpaste, which is why it can effortlessly level itself on the surface.

Another strong suit is its top-tier flexibility!

How so? It does not discolor and harden over time. This incredible amount of flexibility means you can use it on the seams that are constantly subjected to vibrations.

What Are the Drawbacks?

The lone disadvantage we found is its weak nozzle. Keep an eye on this tool because it could alter the way you use your RV caulk.

Pros

• Self-leveling formulation
• Watertight solution
• Long-lasting
• Can withstand strong vibrations and extreme temperature fluctuations
• Versatile to any material

Cons

• The weak nozzle can cause a messy application

7 – SashCo Through The Roof Sealant

Are you an RV owner looking for a through the roof experience? Get this RV roof sealant from SashCo! You can get one at a meager price per cartridge when you opt for a value six-piece pack!

This roof sealant has traits that might not be present in many other competing products. It’s an RV flexible sealant that can stick to wet surfaces, making it great for wet and cold seasons.

Its unique co-polymer rubber formula is suitable for a wide range of materials, including fiberglass, plexiglass.

What more does it have to offer? A permanent elastic roof seal that can invisibly seal cracks and the like.

If you need to replace some roofing panels or repair leaks around your vents, AC unit, or skylights, this is a great choice.

The seal’s structural integrity of this roof sealant that reduces risks of cracking can hold out against the hot summer sun.

Plus, the tight seal and water-resistant properties work together in reducing the risks of water damage.

You can fix leaks as soon as you become aware of them before any long-lasting damage occurs.

What Are the Drawbacks?

It seems to have inconsistency when it comes to drying. Some customers claim it dries up too quickly, while others say it takes too long to dry up.

Pros

• Sticks to wet surfaces
• Weatherproof
• Reduces risks of water damage
• Flexible
• Budget-friendly

Cons

• Inconsistent drying quality

8 – SashCo Lexel Adhesive Caulk

Well, what do you know? We have another SashCo product!

This lexel adhesive caulk does NOTHING but showcases why RV owners should hold it in such high regard.

It has the highest level of tear resistance and cracks resistance as well! In other words, there isn’t a potential issue that the lexel caulk isn’t heavily prepared to prevent.

Perfect for your RV’s roof, it won’t be affected by scratches even if you scrub it really hard. You can also take comfort in it being both water and mold-proof.

The RV sealant is made of components that reject the growth of these unwanted substances. It’s both useful and healthy for you and your family when you guys go camping.

When your RV picks up dirt around the caulking, you should have no issue with it tearing or coming off during the RV cleaning process.

What Are the Drawbacks?

Here’s the catch! You need to be careful when handling this product.

The product contains chemicals (polycarbonate and polystyrene) that are harmful to the body. Please AVOID inhaling them. When in doubt, make sure to work outdoors and in an open-air area.

Pros

• Tear-resistant
• Crack-resistant
• Waterproof
• Mold proof

Cons

• Chemicals are harmful to the body

9 – RecPro 1021 Self-Leveling RV Sealant

RecPro’s Self-Leveling Sealant is truly one for the books! It’s an all-weather caulk for your RV’s roof.

This sealant by RecPro is the best caulk for fiberglass RV because it will keep your RV leak-free for years.

Why is this the case? It seals cracks on metal vents, stainless steel screws, holes or cracks on the roof, and even the areas around RV air conditioners.

Perfect for flat surfaces, it will spread out on its own without you having to brush it even. Just lay a bead that is thick enough for it to spread and flatten on its own.

If you own an RV with a white roof, this RV sealant would be right up your alley! It will dry completely white.

It is UV-resistant and will not turn a sickly yellow color after several months. Even if you decide not to paint over the seal after it cures, there wouldn’t be questionable patches.

What Are the Drawbacks?

This RV sealant caulk is not usable on vertical surfaces and won’t self-level properly in too cold temperatures. Best to do RV caulking on a sunny day with this one!

Pros

• Leak-free for years
• Perfect for flat surfaces
• Works as a multi-purpose adhesive sealant
• UV resistant
• No discoloration

Cons

• Not usable on vertical surfaces
• Won’t self-level properly at frigid temperatures

10 – Geocel ProFlex Flexible Sealant

If the windows of your RV are made of fiberglass, this RV caulk is perfect for your needs. The formula is crack resistant, yet the solution is flexible and easily fits into the smallest spaces.

Geocel’s known for caulks that can deliver great-looking sealing that isn’t obvious. This flexible sealant is also strong and can absorb vibrations from the vehicle as it hits dips and bumps on the road.

Aside from being strong, it’s great for sealing air compressors, air vents, and AC parts of the RV! Guess what? No excess leaks!

Another feature is being capable of adhering to different surfaces like damp, frozen, and oily conditions.

We recommend creating watertight seals on your RV seams, trim, roof, or around your vents, windows, and doors.

What Are the Drawbacks?

It’s a bit pricey than the usual caulk. However, its quality puts up to the money it’s worth. Besides the price, you can’t use it on rubber or acrylic skylight glazing surfaces.

Pros

• Can work on different materials and surfaces.
• Strong & flexible
• Compatible with most RV types

Cons

• A bit pricey than usual RV caulks
• Not suitable for acrylic
• Color shifts to off white with time

11 – Gray Tremco Vulkem 116 Polyurethane Sealant

One of the most versatile and easy to use products around, the Gray Tremco Vulkem 116 is ideal for all types of surfaces, including textured substrates like masonry and stucco.

You can apply it quickly without hassle, whether you’re caulking for the first time or re-caulking your RV to seal it from leaks.

Because of its versatility, it’s a great caulk to carry around just in case you need it for a certain job. The Caulk Tube is also easy to handle!

The Polyurethane Sealant offers a primer-less adhesion. It just means that you don’t need to apply a primer before using the caulk. It’s also really durable and can withstand heat and rain.

It also works well for its long-lasting performance. With it, you can ensure that you will get the most out of your spending when buying a caulk.

What Are the Drawbacks?

Some disadvantages of this product are that it can’t really work with a manual caulking gun because it is really sticky and has quite a smell.

If you decide to use this caulk, I recommend using it with an automatic air pressure caulk gun so that the sealant can come out easily. Wear a mask when you use it too!

Pros

• Versatile
• Durable
• Also an RV flexible sealant
• Usable on porous substrates
• Can withstand heat and rain

Cons

• Expensive
• Incompatible with a manual caulking gun
• Has a stench

12 – Dap Clear Silicone Sealant

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If you are looking for a silicone RV caulk, the Dap Clear Silicone Sealant is a budget choice if you have areas that won’t need to be resealed regularly.

This silicone caulk provides a watertight seal compatible with glass, ceramic, metals, wood, plastics, rubber roofs, and various painted surfaces.

Completely weather and waterproof, this clear silicone sealant is unaffected by extreme temperatures.

Whether you’re RVing in the deep south or camping in your motorhome, no storm, rain, or sunshine would end up ruining the seal!

This RV caulk is also mildew resistant. This will keep your rig looking at its best even in damp conditions, preventing those unsightly black flecks from appearing.

What Are the Drawbacks?

The only problematic thing about this is the cartridge, but it has exceedingly good quality for a low price.

Pros

• Budget-friendly
• Weatherproof
• Waterproof
• Mildew resistant
• Flexible

Cons

• Problematic cartridge

What to Know About RV Caulks: A Beginner Buyers Guide

Part of the shopping experience in buying an ideal caulk for motorhomes is familiarizing ourselves with some essential factors.

However, don’t stop there! You need to educate yourself with the following pointers:

• Different types of RV
• RV caulking tips
• Which would be the best RV caulk for your RV?

Are you excited? Let’s begin!

What Is an RV Caulk?

An RV caulk is specifically designed, formulated, and used in trailers, campers, motor homes, and recreational vehicles. It works by filling and sealing cracks and gaps.

This product is used in recreational vehicle repairs and maintenance. It can also help in sealing leaks that would otherwise cause water damage to your vehicle.

Using it, you can prevent spending on hefty leak repairs and water damage that your RV might suffer from due to water buildup to collect in the gaps and cracks between two surfaces.

Why Do You Need an RV Caulk?

Perhaps, you’re also asking, Why do I need to caulk my RV and maintain its sealing? The reasons we have prepared are in the following.

Money-Saving

Of course, saving you the money and time is one of our objectives in helping you get an RV caulk. Going to a hefty repair shop multiple times will cost you time and money.

With caulking, you can ensure that scenario and all that errand is out of your way.

Seals Gaps Effectively

Wondering which type of RV caulk or RV sealant you should buy or use? Make sure to buy one that gives you peace of mind and assurance that it will work in keeping your RV watertight.

With an RV caulk, you should have no worries about the gaps existing between at least two surfaces in your RV.

Mold and Mildew Prevention

The same thing goes for taking care of everything we love.

We’re sure you love your RV, so it’s essential to ensure it does not attract molds and grow mildew.

Fighting mold and mildew might be hard to achieve if you won’t use a caulk to seal around the roof’s edges, air vents, venting systems, and pipes.

With an RV caulk, you can prevent these harmful organisms from infesting your RV and from developing in the crevices and cracks in the first place!

But wait, there are so many types of RV caulks in the market. How will you look for the right RV caulk?

Let’s keep going, shall we?

Types of RV Caulks

There are countless types of caulks that you can use for your RV. All you have to do is choose the best caulk that suits your needs the most.

Here are some of the commonly used RV caulks that you’ll see in the market:

Fireproof Caulk

This red-colored caulk is made to be fireproof. Although not most people need a fireproof caulk because using this needs extra safety precautions.

This RV caulk is only used during forest fire (hopefully, you never experience that in your lifetime).

The flames won’t go in through the cracked places with a seal because the fireproof caulk is BLOCKING them.

Vinyl Caulk

A vinyl caulk is SIMILAR to a caulk made out of acrylic materials.

However, the MAJOR DIFFERENCE is the former lasts longer than the latter, making it better to use outdoors.

This is the best caulk for RV owners who use their RVs a lot! The only party pooper is that it’s not that flexible.

Silicone Caulk

Silicone caulks tend to be highly resistant to water damage. Unfortunately, this IS NOT the best caulk for RV exteriors.

Other than that, the great thing about them is that they are also mold and mildew proof, which only means that no matter how wet they get, they won’t attract molds.

Go for this type of caulk if you want to seal cracks and holes in RV showers and other water damage-prone locations.

Adhesive Caulk

RV caulks are naturally sticky, so you can expect them to stick very well on any material or surface.

When you need to glue off a part that fell off and created a crack, then these are the best RV caulks for that!

This RV caulk can seal off a crack and stick pieces back together again with much efficiency.

Acrylic Caulk

Now we put this as the last type of RV caulk because it is the MOST COMMON type you’ll find and is also the CHEAPEST!

These are intended for wider use on smaller cracks than the others, and they perform well on wood and drywall material.

We’ve filled you in on the types, now let’s move on to the essential factors you need to consider!

Factors You Need to Consider When Buying an RV Caulk

What Are You Sealing?

Consider why you need a caulk in the first place. What are you sealing? What do you need it for?

Surely, you noticed a crack somewhere in your RV, and you wish to repair it. Go back to that crack and sift through it meticulously.

So if that’s a hole, you’d want to skim the list and find one that does. If it’s just a small crack, a simple RV caulk made of acrylic will do.

Why Are You Sealing?

The reasoning behind your need for an RV caulk is crucial as well.

That reason will greatly be the DETERMINING FACTOR of which product you end up purchasing.

What Kind of RV Do You Have?

Compatibility and durability matter.

Remember that most caulks don’t work well with every material. Check your RV material first before go back to the list and find one that would work.

Top sealants seem to have a problem with rubber surfaces. Sadly, that’s what many RV roofs use.

If your RV material is flexible, go for a rigid sealant. If the material is aluminum or fiberglass, find a sealant that works well with tubes like acrylics.

Damage Resistance

An RV sealant’s damage resistance is SIGNIFICANT because it dictates the lifespan of the seal. A good damage-resistant seal is STRONG enough to withstand forces that could break or shatter it.

Most RV caulks do not have this feature so expect them to cost a little more than normal caulks.

Cost

Of course, MONEY is always the biggest factor you need to consider—the GREATER the features, the HIGHER the price.

Sure, it’s a great feature-packed caulk, but can you afford it? Some caulks are MORE EXPENSIVE than others, especially the top brands!

You get what you pay for, so you need to shell out MORE money if you want an excellent sealant. But NOT ALL cheap sealants are terrible, so be smart!

Ease of Use

An RV caulk that you can easily use is another crucial thing that comes to this list. If you made a mistake while applying, it should also be easy to clean up.

Do you want to spend the entire weekend sealing holes in your RV? Probably not.

The caulk you buy needs to be reasonably straightforward to apply. It will offer LESS effort, which would give you more time for other tasks.

Flexibility

Ensure that the RV caulk that you purchase has a distinct level of flexibility. This feature helps the product withstand turning WITHOUT breaking.

It ensures your RV caulk remains effective no matter which environment you’re in. It’s another quality that boosts the product’s overall durability.

Waterproof

The waterproof capabilities of an RV sealant dictate the life or death of your seal. If it doesn’t have this feature, you’ll probably end dealing with a leak.

RVs are subjected to changing weather conditions and heavy rainfall ALL THE TIME! If your seal is not waterproof, it won’t last long!

UV Resistance

The last factor that we think you should consider is if it has UV resistance!

This feature is still rare, especially on sealants. But it’s important to find this feature on your caulk to slow down your RV’s deterioration.

It will also allow your caulk to hold up against hotter climates. Just think about how often you’ll be outside during the summer!

The Benefits and Drawbacks of RV Caulks

Different RV caulks come with different benefits and drawbacks. Still, many top-notch options tend to share SIMILAR advantages and downsides.

Benefits

• Blocks off leaking
• Prevents Insects and Debris From Entering
• Increases your RV’s value
• Protects RV’s interior and exterior from potential damage from the elements
• Reasonable price options for different budget constraints

Drawbacks

• Caulks, in general, aren’t flexible
• Most caulks aren’t suitable for vertical surfaces
• Might crack under extreme temperatures
• Some models are NOT paintable or resealable
• Might be too expensive for their performance

FAQs

Buying RV caulks and sealants will naturally bring you many questions, especially if you’re a beginner. We’ve sorted out questions from first-time RV owners that you also might have.

Can I Use the Same RV Caulk for Other Repairs?

YES! RV sealants are usable on other repairs.

However, there’s NO guarantee that you’ll get the same good results. RV sealants are designed for RVs, and using them for other things WON’T assure good results.

If you’re asking whether the same caulk can work for different RVs, then no. The caulk’s effectiveness depends on the material.

Why Do You Need RV Exterior Caulking?

Exterior caulking for your RV is needed to prevent water from seeping into the cracks and spaces.

It is also important to prevent outside elements, such as moisture, snow, and rain from entering your vehicle.

Lastly, it will keep the bugs and insects away! You wouldn’t want to deal with these little pests in the middle of the road.

How Long Should I Expect the Seal to Last?

This will completely depend on how much you use the RV and what sealant you have purchased.

Good caulks could last you a year or two, even if you use your RV a lot. You won’t have to reapply repeatedly.

The advantage of the best ones on the market is they last 2X LONGER than the cheap ones.

Does an RV Caulk Work on Every Material?

Frankly speaking, it might not.

You should check the label and find out what materials it can seal to prevent any disappointment.

Caulks have different strengths and weaknesses. The reason behind this is the varying kinds of caulks.

It’s your job to figure out the type of caulk to buy based on the application material where you intend to use it.

A Recap of the Top Picks!

Pro Flex Super Flexible Elastomeric RV Sealant (BEST OVERALL)

This sealant can be the next big thing! It’s super flexible and can self-level on its own WITHOUT any mess at all!

You also enjoy a 50-year lifespan from ONE APPLICATION ONLY. Talk about BEST of the BEST!

Butyl Putty Tapes (BEST VALUE)

A totally different-looking sealant from this list but will amaze you with the things it can do! Who would’ve thought that there would be a mold that could form into any shape?

A tape that’s weather and waterproof that can withstand hot and cold environments? YES PLEASE!

We’d call it the SUPER SEALANT TAPE!

Gorilla Silicone Sealant Caulk (BEST BUDGET PICK)

The best silicone sealant there is! It won’t give you a difficult time when applying and has UV resistance.

Like what we said earlier in this article, it’s capable of so many wonders! You can almost rely on it for any sealing needed.

Plus, it DOES NOT hurt your pockets too!

End of the Road

That’s about it, future adventurer! Make sure that you’re prepared for anything that might happen on the road.

Cracks and slits should be high on your priority to look out for whenever you’re on the run. You should always be ready to repair those cracks the FIRST moment you see them on your RV!

Remember that the best caulk will cost you, but they’ll save you even MORE money from repairs.

That’s why you MUST choose and invest in a high-quality RV caulk. We hope this article has helped you secure your way back on the road!

Safe travels!