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Best RV Roof Sealant of 2019: Save Your Camper!

by | Last updated Mar 15, 2019 | Maintenance, Reviews

If you own an RV, what do you do if the weather turns foul and you find rain leaking through your roof? Protecting your roof with the best rv roof sealant will spare you this circumstance before it happens. A roof sealant will keep you cozy and dry inside your RV even with a storm is raging outside.

You want to find the right roof sealant, though. There are many of them on the market, with different compositions, thicknesses, and functions. In addition, there are quite a few other things to consider — budget, use, sealant specifications, and so on. Let’s take a look at some of the better options available.

The Best RV Roof Sealant

NameQuantitySurfaces 

Geocel

10 oz

Aluminum, steel, glass, fiberglass, vinyl, and wood

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EternaBond

50 ft.

Wood, rubber, metal, tiles, concrete, PVC, TPO, EPDM, fiberglass

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Proguard

32 oz

Aluminum, steel, PVC, rubber, fiberglass, and wood

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Heng's

10.1 oz

Roof vents, AC units, skylights, and antennas

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ToughGrade

41.2 oz

Galvanized metal, wood, rubber, fiberglass, TPO, vinyl, aluminum, mortar, and concrete

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Geocel

Quantity

10 oz

Surfaces

Aluminum, steel, glass, fiberglass, vinyl, and wood

Check Price

EternaBond

Quantity

50 ft.

Surfaces

Wood, rubber, metal, tiles, concrete, PVC, TPO, EPDM, fiberglass

Check Price

Proguard

Quantity

32 oz

Surfaces

Aluminum, steel, PVC, rubber, fiberglass, and wood

Check Price

Heng’s

Quantity

10.1 oz

Surfaces

Roof vents, AC units, skylights, and antennas

Check Price

ToughGrade

Quantity

41.2 oz

Surfaces

Galvanized metal, wood, rubber, fiberglass, TPO, vinyl, aluminum, mortar, and concrete

Check Price

1. Best Overall

Geocel Pro Flex RV Sealant

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This sealant’s chemical composition makes it perfect for sealing aluminum, steel (plain and coated), glass, fiberglass, vinyl, and wood — materials that are commonly used to build RVs, campers, and trailers. The sealant’s tripolymer formula enables it to form a watertight seal even when the surfaces it’s applied to are oily, wet, or frozen.

Since it’s flexible, the sealant works well when applied to your RV’s movable joints. Also, its sealing effect works immediately after application, no matter the temperature or the weather, and it is non-stringing and can be easily applied and cleaned up.

After the application, you don’t need to wait to drive anywhere in your vehicle. The superior elastic and adhesion properties of the tripolymer sealant make it a better choice than silicone sealants. In addition, the sealant comes in five colors – clear, white, bright white, almond, and black, and you can easily apply it over a previously applied sealant too.

Pros and cons

  • Durable, can last for almost 25 years
  • Resistant to cracks, UV, mildew, and dirt
  • Can be applied in layers
  • Strong odor
  • Cannot be used on rubber, styrofoam, EPDM, and insulation
  • Not safe for food and water storage areas

2. Best Value

Eternabond RoofSeal Sealant Tape

Our Rating

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RoofSeal tapes can be used to repair non-pressurized leaks and for corrosion protection, especially on RV roofs. You can use the tape on a range of roof materials such as wood, rubber, metal, tiles, concrete, PVC, TPO, EPDM, fiberglass, and more. The tape can seal any tears and joints in the roof, skylights, copings, and gutters. It is even useful for sealing the liners of ponds and landfills.

EternaBond’s trademark MicroSealant technology gives RoofSeal the capability to make watertight and airtight barriers on roofs. The MicroSealant contains thermoplastic, synthetic resin, and non-curing rubber. It has a UV stable backing and a built-in primer that helps the sealant to adhere easily to any surface.

The elongation factor of the sealing tape is more than 700%. So, RoofSeal can expand and contract as per the weather conditions and ensure that the roof remains sealed.

Since the tape is also very flexible, you can fold and wrap it, even over itself. It is also available in white, grey, tan, and black.

Pros and cons

  • Can be used to seal over 30 types of material
  • It has a sag rating of over 250°F
  • It remains flexible even in temperatures of -70°F
  • Requires surfaces to be very clean before use
  • Cannot adhere to silicone

3. Best in Formula Potency

Proguard Liquid Roof for RVs

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This EPDM liquid sealant is ideal for waterproofing all types of RV roofs, including aluminum, steel, PVC, rubber, fiberglass, and wood. It is quite easy to apply, even if you have never sealed an RV roof before. Also, a gallon of sealant can cover an area between 42 and 46 feet, so it turns out to be cost-effective.

You only need to paint on a single layer of the sealant, as it dries quickly. It is effective immediately after application and forms a white, shiny, rubbery film that’s 20 to 30 mil (0.02 to 0.03 inches) thick.

The coating’s adhesive properties can withstand temperatures as low as freezing to as high as 300 degrees Fahrenheit. Additionally, since the sealant has superior reflective properties, it keeps the area underneath the coated roof cooler than it would otherwise be, which means you can save on air conditioning costs. What’s more, the sealant also has noise-absorbing properties.

Pros and cons

  • Resistant to algae and mildew
  • Resistant to UV and ozone
  • Can last for several years
  • Non-polluting
  • Solidifies quickly, so you have to apply it fast
  • In low humidity, it takes longer to set

4. Best on a Budget

Heng’s NuFlex RV Sealant

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When you’re installing vents, skylights, air conditioning units, and other essentials, you must make joints for their installation. You then have to waterproof these joints to prevent the roof from leaking when it rains.

Luckily, this white sealant makes it easy to seal joints on horizontal surfaces like RV roofs. In addition to that, it can also seal concrete floors, swimming pool decks, garages, driveways, and sidewalks.

It is made of neutral cure elastomeric silicone. Its fluidity makes it self-leveling, so you can easily (and quickly) apply it to a surface. Also, it adheres tightly, even without a primer.

However, the sealant takes two hours to cure, and it is necessary to ensure that it does not come into contact with water before that time is up. Once cured, it becomes strong and flexible. As a result, it will not crack and will last for a long time.

Pros and cons

  • Good for both indoor and outdoor use
  • Best for sealing narrow areas
  • Doesn’t leave any stains
  • Cannot be used for sealing vertical surfaces
  • You need to wear protective gear for hands and eyes when applying
  • Cannot be painted

5. Best in Lubricity

ToughGrade Self-Leveling RV Lap Sealant

Our Rating

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This is an ideal sealant for motorhome and trailer roofs, but you can also use RV Lap for sealing boats and other marine surfaces that remain underwater for long periods of time.

The self-leveling sealant is especially good at sealing the narrow spaces around air vents and along the edges of the roof. It adheres well to many roofing materials such as galvanized metal, wood, rubber, fiberglass, TPO, vinyl, aluminum, mortar, and concrete.

After it cures, the sealant forms a firm watertight layer. It is flexible and does not crack even in high temperatures. Its UV stabilization property ensures that the sealant does not discolor the surface it is applied on, and it also prevents the deterioration of the surface.

Pros and cons

  • Very durable
  • It doesn’t leave any stains
  • Can be used only on horizontal surfaces
  • May cause skin irritation
  • Releases unpleasant odor

What to Look for Roof Sealant for Your RV

Regular exposure to different elements can take a toll on an RV over time. The roof might develop heat-induced cracks that can later catch rain. When this rainwater freezes, it will expand and enlarge the cracks. So unless you address the issue right away, your RV is going to end up with a leaky roof.

Liquid Roof Sealant Vs. Self-Priming, Adhesive Roof Sealant Tape

Roof sealants are available in liquid form and as an adhesive tape. To decide which one of these will suit you, we will need to consider the area we want to seal and the type of sealant that is easiest to apply.

Using a Roof Sealant Tape

Of the two, adhesive roof sealant tape is quicker and simpler to install. You can use it to cover flat surfaces as well as apply it in tight corners.

As soon as it is in place, you are good to go. There is no need to wait around for it to dry or cure. Also, if you make a mistake while installing the tape, we can remove it without making a mess and start over again.

Using a Liquid Roof Sealant

Liquid roof sealants are effective and can offer a permanent watertight finish. However, even though they can usually be used on various roof materials, some have material-specific formulas.

In addition to sealing the roof against leaks, these sealants can offer protection from excessive heat and UV radiation. They also prevent or minimize energy loss and are easy to apply.

The best part? You can correct any application mistakes by removing the sealant or applying a fresh layer over the previous coating.

Factors to Consider Before Choosing an RV Roof Sealant

What is the Roof Made of?

The roof sealant you use must be able to bond well with your RV’s roof. So, it’s crucial to know if the roof is made of Ethylene Propylene Diene Monomer (EPDM), Thermal Polyolefin (TPO), or some other roof material. Once we figure that out, we can find a material-specific formulated sealant for it.

Please note that you may have to clean the roof before you apply the sealant. Also, if the RV roof has too many cracks, you might have to buy more sealant.

How Much Elasticity Does the Sealant Have?

The reason we are looking for a sealant in the first place is because of issues caused by weather-related expansions and contractions. Since environmental changes will continue to affect the roof, we want a sealant that can conform to these changes.

We also want the sealant to withstand foot and vehicular traffic vibrations. Otherwise, we will end up with a cracked or torn sealant. To avoid that, we need to buy an option with superior elastic properties.

Is the Sealant UV-Resistant?

In addition to sealing the roof, the sealant can also shield it from high temperatures and UV damage. A roof sealant with high reflective properties will deflect heat and light rays away from your RV. As a result, you will have a pleasantly cool interior and a well-protected exterior.

Conclusion

When looking for an RV roof sealant, go for a versatile option that you can use on a variety of surfaces, in various weather conditions, and for many different applications. Before making a decision, determine the type of surface you’re going to apply the sealant to and pick an option accordingly.

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Best RV Roof Sealant of 2019: Save Your Camper!
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Richard Reed

Writer for TheVehicleLab.com

The Vehicle Lab

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