---
product_id: 49495877
title: "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"
brand: "w4"
price: "€ 50.06"
currency: EUR
in_stock: true
url: https://www.desertcart.hr/products/49495877-w4-mastic-sealing-strip-for-caravans-and-motorhomes-white-19mm
store_origin: HR
region: Croatia
---

# Weatherproof & leak-resistant Easy DIY application 19mm thick durable seal 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

**Brand:** w4
**Price:** € 50.06
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal the deal, protect your adventure!

## Quick Answers

- **What is this?** 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 by w4
- **How much does it cost?** € 50.06 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/49495877-w4-mastic-sealing-strip-for-caravans-and-motorhomes-white-19mm)

## Best For

- w4 enthusiasts

## Why This Product

- Trusted w4 brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **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.

## Overview

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.

## Description

Full description not available

## Features

- Versatile Sealing Solution: Ideal for sealing and re-bedding a wide range of caravan and motorhome fittings, including overlap joints, awning rails, roof-lights, vents, and window surrounds.
- Multi-Surface Compatibility: Perfect for use on aluminium mouldings, exterior lights, grab handles, and most external trims, ensuring a secure and long-lasting seal.
- Durable & Weather-Resistant: Formulated to withstand outdoor conditions, this mastic sealing strip provides a reliable, weatherproof seal to protect against leaks and damage.
- Easy to Apply: Convenient and simple to use, this sealing strip makes it easy to maintain and upgrade your caravan or motorhome fittings without the need for professional assistance.
- High-Quality Performance: Trusted by caravan and motorhome owners, the W4 Mastic Sealing Strip delivers strong adhesion and lasting protection for all your external trims and fittings.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |

## Product Details

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

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/71B1CgCrWlL._AC_UL320_.jpg)
![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 - Image 2](https://m.media-amazon.com/images/I/71B1CgCrWlL._AC_UL480_FMwebp_QL65_.jpg)
![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 - Image 3](https://m.media-amazon.com/images/I/71B1CgCrWlL._AC_UL640_FMwebp_QL65_.jpg)
![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 - Image 4](https://m.media-amazon.com/images/I/71B1CgCrWlL._AC_UL800_FMwebp_QL65_.jpg)
![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 - Image 5](https://m.media-amazon.com/images/I/71B1CgCrWlL._AC_UL960_FMwebp_QL65_.jpg)

## Available Options

This product comes in different **Colour Name, Size Name** options.

## Questions & Answers

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

## Frequently Bought Together

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**Shop now:** [https://www.desertcart.hr/products/49495877-w4-mastic-sealing-strip-for-caravans-and-motorhomes-white-19mm](https://www.desertcart.hr/products/49495877-w4-mastic-sealing-strip-for-caravans-and-motorhomes-white-19mm)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-02-02*