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W4 Mastic Sealing Strip for Caravans & Motorhomes White 19mm – Weatherproof Sealant for Overlap Joints, Awning Rails, Roof-Lights, Window Surrounds & External Trims, Durable & Easy to Apply

W4 Mastic Sealing Strip for Caravans & Motorhomes White 19mm – Weatherproof Sealant for Overlap Joints, Awning Rails, Roof-Lights, Window Surrounds & External Trims, Durable & Easy to Apply

Q: Is this double-sided and sticky - so it would stick and seal polycarbonate sheeting to its wood frame?

Not sure about sticking to polycarbonate but as a sealing strip it worked brilliantly to my motorhome GRP body! The parts ultimately were screwed together so if this is the same assembly method you should be fine

Q: Would this be suitable to fix a cycle rack leaking braket on the back of the moho - was thinking loosening, cleaning and then resealing with this

I used it for reselling the Truma water heater flange to the outside of the caravan. I found the mastic tape to be too thick and difficult to work with. I think you would be better using CT1 Sealant or similar which I used to bond and seal the mounting feet of the Solar Panel, to the Caravans roof. Hope this helps.

Q: Is this tape double sided

Yes it is, once the protective non-stick separator tape is removed. It is simply there to stop the mastic sticking to itself and to aid installation.

Q: Will it stick to silicone sealent around a van roof vent?

Yes, it will stick to just about anything you apply it to. However, I have resealed a roof light/vent before and what you are planning is not your best course of action. You should remove the roof vent completely, and then use a silicone removal solution to remove the old silicone from both mating surfaces. Note, silicone should never have been used to seal it in the first place. You can buy a small bottle of silicone remover from Screwfix for around £5. Then buy the wide mastic sealing strip, (Not the narrow). Then refit the roof vent. When you have screwed it down, any excess mastic that squeezes out can easily be removed by wiping it off using white spirits.

Product ID: 49495877

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Details

Brand
W4
Material
Butyl
Colour
White
Product dimensions
14L x 16W
Item thickness
19 Millimetres

🌧️Weatherproof & leak-resistant

🛠️Easy DIY application

🛡️19mm thick durable seal

Description

🛠️ Seal the deal, protect your adventure!

TRUSTED DURABILITY - Formulated with high-quality butyl for long-lasting adhesion and resilience outdoors.
PERFECT FIT FINISH - 5 meters of sleek white sealing strip designed to blend seamlessly with your caravan’s exterior.
EFFORTLESS DIY UPGRADE - Apply quickly and easily without professional help—maintain your motorhome like a pro.
ULTIMATE WEATHER DEFENSE - Protect your caravan from leaks and damage with a 19mm thick, weatherproof seal.
VERSATILE MULTI SURFACE COMPATIBILITY - Seals aluminium mouldings, awning rails, roof-lights, and more for a flawless finish.

The W4 Mastic Sealing Strip is a 5-meter, 19mm thick butyl sealing tape designed for caravans and motorhomes. It offers durable, weatherproof protection for overlap joints, awning rails, roof-lights, and external trims. Easy to apply and compatible with multiple surfaces, it ensures a reliable, long-lasting seal that prevents leaks and damage, making it an essential upgrade for any outdoor vehicle enthusiast.

Specifications

Manufacturer	W4
Part Number	00116
Product Dimensions	2.6 x 5.75 x 6.38 cm; 430 g
Item model number	00116
Size	5m x 19mm
Colour	White
Style	Sealing Strip
Material	Butyl
Thickness	19 Millimetres
Item Package Quantity	1
Included Components	Sealing Strip 5m
Batteries included?	No
Batteries Required?	No
Item Weight	430 g

Have a Question? See What Others Asked

Is this double-sided and sticky - so it would stick and seal polycarbonate sheeting to its wood frame?

Would this be suitable to fix a cycle rack leaking braket on the back of the moho - was thinking loosening, cleaning and then resealing with this

Is this tape double sided

Will it stick to silicone sealent around a van roof vent?

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