The Best Caravan Sealant 2020

Caravan sealant is an essential product for tackling leaks or cracks within your caravan. Compared to standard sealants, they are much stronger and ideal for roofs, skylights, windows and other interior or exterior components.

Best Caravan Sealant

The best sealant for caravans is the Sikaflex 512, which is designed specifically for caravans and comes in a 300 ml cartridge. It’s suitable for a wide range of caravan applications and can even be sanded down and painted over.

Caravan Sealant Comparison

Caravan SealantTypeCapacity
Sikaflex 512Cartridge300 ml
Hodgsons Seamseal CVCartridge380 ml
W4 Caravan Mastic SealingStrip5 Metres
Captain Tolley’s Creeping Crack CureTube60 ml
Dekalin Dekasyl MS-5Cartridge290 ml
Soudaseal RV 61Cartridge290 ml

Leaks or cracks within your caravan can be repaired in a matter of minutes using one of the recommended caravan sealants. We strongly advise keeping a sealant in your caravan as leaks can be very unpredictable.

Below is a list of the best sealant for caravans that are easy to use and suitable for interior or exterior use.

The Best Sealant For Caravans


1. Sikaflex 512 Caravan Adhesive & Sealant


By far the most popular and highly rated caravan sealant is the Sikaflex 512. It’s an all-purpose adhesive and sealant that’s been designed especially for caravan, motorhome or trailer repairs.

According to the brand, you can use this caravan sealant for roof vents, skylights, TV aerials, windows strips and much more. Before application, the surface must be clean, dry and free of any oil, grease or old sealant.

Other features of the Sikaflex 512 include:

  • Designed specifically for caravans
  • Can be sanded and painted
  • VOC and solvent free
  • Low odour output
  • Interior or exterior use
  • Requires a caulking gun
  • 300 ml cartridge

The Sikaflex 512 is by far the best caravan sealant on the market and suitable for most caravan or motorhome repairs. It’s slightly more expensive than the alternatives but it’s the ultimate sealant that won’t disappoint.
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2. Hodgsons Seamseal CV Bedding Sealant


Another sealant that’s dedicated to caravan or motorhome repairs is the Hodgsons Seamseal CV. It’s a versatile sealant that’s suitable for a wide variety of joints that can be found in a caravan.

Other features of the Hodgsons Seamseal CV include:

  • 100% dry within a couple of days
  • Accommodates slight movement
  • Excellent adhesion to coated metals
  • Designed for easy extrusion and tooling
  • 380 ml cartridge size

The Hodgsons Seamseal CV is an easy to use caravan sealant that leaves an excellent finish and is ideal for resealing a range of joints. It also offers excellent value for the money when you compare the price per 100 ml.
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3. W4 Caravan Mastic Sealing Strip


An alternative caravan sealant to the other formulas within this article is the W4 Mastic Sealing Strip. It comes in a 5 metre reel and is ideal for sealing awning rails, roof lights, vents, windows and many other components.

Other features of the W4 Mastic Sealing Strip include:

  • Double sided tape
  • Comes in a 5 metre reel
  • Formulated for sealing and re-bedding
  • 19, 32 and 45 mm widths available
  • White finish to the strip

The W4 Mastic Sealing Strip is a unique caravan sealant that’s ideal for most external trims of your caravan or motorhome. Unlike the mastic cartridges, many people may prefer to use a strip for certain situations.
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4. Captain Tolley’s Creeping Crack Cure


One of the cheapest caravan sealants that’s actually worth buying is the Captain Tolley’s Creeping Crack Cure. It’s a quick and easy to use formula that’s flexible and dries into a transparent formulation.

According to the brand, it’s formulated to be thinner than water and is able to penetrate deep inside of the narrowest of surfaces. Once settled, it produces a clear waterproof seal that prevents leaks.

Other features of the Captain Tolley’s Creeping Crack Cure include:

  • Rapid penetration and fast drying
  • Water based formulation
  • Transparent waterproof seal
  • Can be applied via a hypodermic syringe
  • Compatible with most surfaces
  • Ideal for skylights, windows, rivet holes and much more

The Captain Tolley’s Creeping Crack Cure is a high quality sealant that’s perfect for problematic hairline cracks. Whether you are sealing the windows or roof of your caravan, this formula won’t disappoint.
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5. Dekalin Dekasyl MS-5 Caravan Sealant


The Dekalin Dekasyl MS-5 is a polymer elastic adhesive and sealant that’s designed primarily for caravans or motorhomes. From tackling the roof of your caravan to a window, the formula will bond and seal the surface.

Other features of the Dekalin Dekasyl MS-5 include:

  • Suitable for interior and exterior use
  • Elastic formulation with a white finish
  • Can be used with 12V or 24V appliances
  • Used by many manufacturers
  • Made in Germany
  • 290 ml cartridge

Overall, the Dekalin Dekasyl MS-5 is a high quality caravan sealant that’s suitable for both interior or exterior use and leaves a great finish. The only main drawback is that it’s one of the most expensive within this article.
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6. Soudaseal RV 61 White Caravan Sealant


The Soundaseal RV 61 is a highly rated caravan sealant which the brand state is used by many major manufacturers in the UK. The chemically neutral hybrid polymer is designed for interior or exterior use and forms a strong yet elastic bond that resists the effect of vibration.

Other features of the Soundaseal RV 61 include:

  • Bonds and seals
  • High level of adhesive strength
  • Suitable for metal, plastic and painted surfaces
  • 290 ml standard cartridge
  • White finish

Overall, the Soundaseal RV61 is a versatile caravan sealant that’s ideal for the roof, windows, awning rail, skylight and many other surfaces within your caravan. It isn’t the cheapest but it provides a high level of adhesive strength and used by many major caravan manufacturers.
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Conclusion

Before applying any of the sealants listed above, you will want to ensure the surface is clean, dry and free of any grease or oil. Depending upon the application, many of the sealants can also be sanded down and painted over.

All of our recommendations are suited to a range of budgets and can be applied using a caulking gun, syringe or as a strip. Compared to standard sealants, a caravan sealant is far stronger and worth paying the extra for.

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