Best Caulk for RV Exterior in 2021 – Reviews and Guide

RV owners understand the severity of leaking water due to a failing roof sealant. Long-time owners try to prevent any amount of water from penetrating their recreational vehicles because they understand the effects of water damage in the long run. This the primary reason you, as the owner, should only get the best RV caulk for exterior repairs when the time comes.

Ensure your RV windows and roof are sealed and maintained properly to prevent severe damage to the inside of the motorhome. Also, an effective sealant should control molds from growing within your motorhome. Spending a few hours caulking your RV’s rubber roof edges, air vents, pipes, AC units, doors, walls, and venting systems will prevent you from spending lots of money on repairs down the road.

Are you finding it difficult picking the best RV roof caulk?

In reality, it’s tough to find the right RV caulk since the market is flooded with various caulks for indoors and outdoor jobs. Or what the best product for UV resistance and Waterproofing is? The real problem with some of these alternatives is quality. Most of them are of low quality since some manufacturers are in the business for quick cash. Therefore, the customers must understand the RV market dynamics, enabling them to identify better quality products from lesser ones.

So what’s the significance of this article?

The piece will provide you with relevant information regarding exterior caulking RV products, from various essential factors, like where you should buy, to other crucial details that will enable you to make an informed decision. The content will help you review products to meet your expectations, and water damage will be a thing of the past.

It should be noted that not every caulk will be used on the RV. Caulks such as silicone caulks are not suitable for trailers, mainly because they are too brittle and they get too hard to remove. The other thing, silicones don’t stick on everything, so it could just peel right off.

Many RVers ask whether an RV caulk can work on every RV material and fixture. Parts of campers that need a strong waterproof seal are windows, seams, gutters, roofs, and walls. The materials used to make the mentioned parts include vinyl, synthetic plastic, woods, and other metals. Caulks are designed to work on these materials, but not all of them. Some products are also optimized for vertical structures such as windows, while others are designed for horizontal structures such as roofs.

For your purchasing experience to be less stressful, this RV caulks review has prepared all the details of how to pick the right RV caulk for your trailer or camper.

What is An RV caulk?

Trailer sealant is formulated and optimized for campers, trailers, recreational vehicles, and motor homes. They are made to seal and fill gaps and cracks. Also, this product can be used for vehicle maintenance and repairs. It can also help to seal what causes water damage in rainy times.

Best RV caulks for RV Exterior.

When it comes to shopping for the best Caulk for your RV exterior, you would be overwhelmed after seeing plenty of options available in the market, from self-leveling sealant to paintable caulk options. Since you will need it to seal your recreational vehicle, you must choose the most durable, flexible, and high-quality sealant. After complete research, we came across the below-mentioned sealants. Not to mention, these sealants will work best in sealing your RV surface and prevent water leaks.

Super Flexible Elastomeric Sealant from Pro-Flex

The Super Flexible Elastomeric Sealant is quite a good acrylic sealant you can get your hands on. The product claims to have a fifty-year life. Even if it is not true, the product may last you for several years with its lasting power. This sealant is flexible, which means you can apply it on a variety of surfaces. However, it is ideal for a metal roof, as it has a very tough texture. The best thing about this product is it will not look messy after you have done leveling. Instead, it will create a smooth and finished look after application.

You can paint over it to hide its original color, and therefore it will not become prominent like other sealants. Note that you will need to cure this sealant for a couple of months. While these types of caulks are among the best ones, the only thing that some RV owners do not like is their smell. It has a powerful smell and can be unbearable for some people. Therefore, if you are using it to seal your RV parts, make sure to put a mask on your face to avoid its smell.


  • It can fasten to most materials.
  • You can paint it to create a smooth appearance.
  • It is a high-quality sealant that will last for longer.
  • Boasts impressive contractions and expansion properties
  • An ideal option for metal surface


  • It comes with a strong smell.
  • Curing time is longer than other RV caulks

Self-Leveling RV Lap Sealant from ToughGrade

This is the second-best product on our list because of its quality and features. It works excellently in sealing the venting systems, air con, roofs, and other items. Since it is ideal for marine applications, you can rely on this sealant to protect your RV from rainstorms. It cures robustly and creates a firm layer of sealing on the surface. You can use this sealant on screw heads and vent covers too.

While it is a UV stabilized product, this sealant can protect your RV parts from deterioration and discoloration. Because of its versatility, you can use it for various surfaces and on different types of materials. From mortar, concrete, and aluminum to wood, vinyl, and galvanized surface, you can use this sealant on any material to protect your RV. It does not damage the color or cause any stain on the material. This Self-leveling RV Lap Sealant from ToughGrade can protect your vehicle roof from extreme weather conditions. Overall, it is a durable and flexible option.


  • You can use it on horizontal surfaces
  • It comes in different packaging and sizes
  • Seals screw heads, air conditioners, and venting systems
  • Prevents deterioration and discoloration


  • May cause nose and skin irritation

501LSW-1 Self-Leveling Lap Sealant from Dicor

If you are looking for a rubber roof sealant, you should opt for this amazing lap sealant from Dicor. It secures your roof efficiently and protects your recreational vehicle from harsh weather. The RV roof is susceptible to damage to those outdoor elements like snow, wind, and rain cause. Moreover, the cold temperature can damage your RV roof. Such elements may cause cracks on your RV roof, and you may have to spend hefty amounts on repairs.

Best Caulk for RV Exterior: Lap Sealant

However, this lap sealant not only saves your money but also protects your RV against extreme weather climates. This sealant is ideal for EPDM sheeting. You can use it safely and conveniently for your RV roof. It offers strong adhesion to wood, galvanized metal, concrete, vinyl, aluminum, and mortar. Because this sealant remains flexible, it will not crack over the years. Additionally, you can clean this sealant easily. Overall, this sealant is the best option for sealing your RV, as it will not stain or discolor any material.


  • Prevents water from leaking in the Air conditioner unit and vents
  • Works effectively on EPDM sheeting
  • Offers excellent adhesion to different materials
  • It offers high flexibility and does not crack over time
  • Protects recreational vehicles from water leaks


  • It Will does not work on vertical surfaces as it is self-leveling

1021 Self-Leveling RV Sealant from Alpha Systems

If you are looking for a product to feature amazing weather resistance, you should go for this RV Sealant. Because it includes high-quality materials, this sealant will ensure to withstand rough weather quite easily. This product will prevent you from the common woes that may come with the worst temperatures or weather changes. This sealant will also protect your RV on rainy days.

Best Caulk for RV Exterior: RecPro

It will not wash away or damage even at -40 degrees Fahrenheit, making it the best product to resist extreme conditions. Additionally, the product offers excellent adhesion to a variety of surfaces. When it comes to durability, you will not need to worry about its tearing or peel when applying a paint coat on your RV roof. That means, if a person is painting their RV roof, they will not need to apply another coat of this sealant. This sealant’s self-leveling capabilities are good, so they will not need to put extra effort into leveling up the sealant.


  • Works efficiently on a variety of surface condition and edges
  • Offers high resistance against UV rays and freezing temperatures
  • Fasten excellently to RV surface
  • Features high durability
  • Easy application
  • Outstanding resistance to oil, fuel, and grease


  • It comes with high sticking power

28100V Pro Flex Crystal Clear RV Flexible Sealant from Geocel

The Crystal Clear ProFlex RV Flexible Sealant from Geocel is one of the most versatile sealants available in the market. You can use it for a vast range of applications. Whether you have a small recreational vehicle or a big motorhome, Geocel sealant works effectively on different RVs models. This Proflex sealant can withstand even the worst weather. Additionally, you will not need to worry about its durability, as it will not wash away on rainy days. It boasts great contraction and expansion properties, due to which it can handle temperature changes and joint movements easily.

best Caulk for RV Exterior: ProFlex

It does not matter if your RV surface is damp, oily, or frozen; this sealant will bond with the materials efficiently and give you the best results ever. Because of its flexibility, you can fasten it to a wide range of surfaces. Pro-Flex is highly resistant to cracks and ultra-violet rays. Unlike other sealants, this sealant will not create an unfinished look when applying it to your RV. The best thing about this product is that you can reseal it. You will not need any assistance to apply the sealant. Instead, you will be able to apply it on your own. It is a non-stringing formula, which is quite easy to apply. If you want to use a sealant for wood, vinyl, fiberglass, or steel surface, it will be the best option to seal and protect your RV from leakage.


  • Available in different colors
  • Ensures the maintenance and quick repair
  • Can reapply to the previous application
  • Works on a variety of surfaces
  • Mildew-resistant, water-resistant, watertight seal
  • Easy to apply on surfaces
  • Crack-resistant


  • It may not work effectively on potable water installations, EPDM, and TPO.

Factors to Consider When Buying the best caulk for RV exterior repairs

Before you just randomly pick your waterproof filler, you should review some factors. Below are some aspects you should look for when buying the best Caulk for RV Exterior repairs:

Ease of use and installation

The product should be easy to use and apply. Also, the caulk shouldn’t need a lot of time to accomplish the given task.

Compatibility with various materials and applications

Is the commodity more consistent and useful in many material surfaces? Have a look at the materials used to make it; this will give you a clue whether it’s the right product.

Concerning application, it should be versatile when working on sealing screw heads, roof edges, pipes, venting systems, doors, air vents, and air conditioners. Also, it should be easy to apply when sealing gaps or cracks as a roof sealant.


When buying anything, affordability should be a factor. Buy a product that’s within your reach.

Brand and type

Buy a brand that’s recognized globally. Such brands show that the product is trusted because it offers top performance, delivers high quality, and affordable.

To factor in the type of caulk, you need for your camper or RV, familiarize yourself with the materials you’re going to seal. Some caulks are effective on some elements, while others are not active on other components. The material should guide you.


A high-quality product sticks and works well on the applied surface. More so, the best quality adheres better with age. The product should also be paintable and resealable; it means that it can be re-applied on itself.

Moisture and temperature

Moisture and temperature are essential when making a choice. For instance, if the problem area is moist and wet, you should consider a waterproof caulk to resist mildew and molds. On the other hand, if the domain is prone to excessive heat and coldness, you should pick a caulk to accommodate all weather conditions.

Water Repellence / Block UV Rays

It should be waterproof, meaning it can prevent your RV from rainwater damages and other moisture. Check its compounds to know the capability.

Benefits of RV caulk

Why should you use the best Caulk for RV Exterior repairs?

  • Blocking of leaks

When the rain falls, water penetrates through your camper cracks and air vents, creating damage. To prevent leaks, you need to seal off all the cracks properly for water not to pass through. That’s why a good roof sealant to secure your property efficiently.

  • Curtails molds growth

When water settles in an enclosed and warm space, mildew and molds thrive. This is one of the dangerous things since breathing in mold can be deadly. A good sealant tape or caulk will keep you safe.

  • Blocks entry of insects

Camping takes place in various places; it can be on an open field or thick woods. Once you’re in these kinds of situations, you’re exposed to multiple types of insects. Mosquitoes and bugs are the common insects, and you know the risks you’re exposed to when these insects bite you.

  • Debris can’t fall in

If there are cracks on your trailer, like water, debris will fall inside. Debris can come from trees, air, and anywhere around you. The trash in your camper will make your camper dirty; this will force you to do extra duties. Seal it regularly to prevent such situations.

  • Increases the value of the RV

You can decide to sell your camper at one point. If your camper has holes or leaks, its value decreases drastically. To fetch good money, maintain your RV using the best RV sealants on any cracks and holes.

Types of RV caulk

There are so many types of caulks in the market to feature. But which is the best Caulk for RV Exterior repairs that suits your needs? Below are some of the most popular types of RV caulks to compare.

Acrylic caulk This is the most common in the market.


  • Cheap
  • Effective in smaller jobs such as wall or ceilings, small cracks, and slits
  • Works well on drywall and woods


  • Not effective on big breaks

Silicone sealant caulk When you talk about caulk, everybody relates it to silicone caulk. This is because silicone caulk is an ancient silicone sealant, and it has been used for many years.


  • Mold and mildew proof


  • Too brittle
  • Too hard to remove
  • You can’t stick other silicone sealants on top of it.

Adhesive caulks. These products are naturally sticky and stick very well on surfaces.


  • Easily sticks parts together.
  • Watertight seal for bad weather conditions


  • Once you open them, ensure you apply them immediately. Otherwise, they lose their sticking prowess.

Vinyl caulk It’s similar to acrylic.


  • Lasts longer
  • Works better outdoors


  • Not flexible

Fireproof caulks. These are red-colored caulks that are fireproof.


  • Prevents fire from entering through the sealed cracks


  • They are not necessary since the principal value for caulks is sealing campers from water penetrations.

Best Caulk for RV Exterior Repairs FAQ

Is silicone caulk right for RVs?
It can be used, but it’s less flexible, doesn’t stick easily, and can’t be removed easily. All you need is a sealant that stretches to cover the entire crack.
Can RV caulk work well with other materials apart from RVs?
Mostly they can work with every kind of material, but it’s not advisable to use the products for other purposes apart from RVs. Besides, some RV caulks can work for all materials while others can’t.
RV caulk stays on the applied surface for how long?
How many times are you using your RV? The more use, the less lasting it can be. It’s advisable to re-caulk twice a year. This makes it to stay long.
How do you caulk an RV rooftop?

This is a simple task. Follow the below steps.

Ensure there’s no snow or rain when caulking
Clean the roof with a solution of water and soap
Thoroughly dry it off
Find the holes and cracks
Pull out the caulking gun and cut the tip
Apply the caulk on the holes and cracks
Smoothen it
Wait for it to dry off


I hope you were able to benefit from these tips about RV caulks. RV caulk is essential for any camper to protect their property in any weather condition. To be on the safe side, you need the best product. Otherwise, you’re bound to run into problems down the road if you use substandard products. There are various aspects to review when buying RV caulks for recaulking and resealing your RV, but it’s worth to buy a caulk that saves your effort, time, and money.

Charley Waters

Hey! I have been fond of the topic of RV for more than 5 years. I have experience in the features of life on wheels. I'm a member of various RV communities and support communication with people who living in RV full time. I hope my articles will be useful to you.

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