---
product_id: 48713368
title: "W4 Mastic Sealing Strip Grey – Waterproof Butyl Seal Tape for Roofs, Windows, Doors & Caravans, Flexible Weatherproof Adhesive Strip for Gap Filling, Leak Repair & DIY Applications (19mm)"
brand: "w4"
price: "FREE"
currency: EUR
in_stock: false
url: https://www.desertcart.hr/products/48713368-w4-mastic-sealing-strip-grey-waterproof-butyl-seal-tape-roofs
store_origin: HR
region: Croatia
---

# Weather-Resistant Multi-Surface Compatibility Easy to Apply W4 Mastic Sealing Strip Grey – Waterproof Butyl Seal Tape for Roofs, Windows, Doors & Caravans, Flexible Weatherproof Adhesive Strip for Gap Filling, Leak Repair & DIY Applications (19mm)

**Brand:** w4
**Price:** FREE
**Availability:** ❌ Out of Stock

## Summary

> 🚐 Seal the Deal with W4!

## Quick Answers

- **What is this?** W4 Mastic Sealing Strip Grey – Waterproof Butyl Seal Tape for Roofs, Windows, Doors & Caravans, Flexible Weatherproof Adhesive Strip for Gap Filling, Leak Repair & DIY Applications (19mm) by w4
- **How much does it cost?** FREE with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/48713368-w4-mastic-sealing-strip-grey-waterproof-butyl-seal-tape-roofs)

## 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 by Owners:** High-quality performance that caravan enthusiasts rely on.
- • **Weatherproof Wonder:** Durable design that stands up to the elements.
- • **Seal with Confidence:** Versatile sealing solution for all your caravan needs.
- • **Long-Lasting Protection:** Secure your fittings with a reliable, strong adhesion.
- • **User-Friendly Application:** No professional help needed—DIY made easy!

## Overview

The W4 Mastic Sealing Strip is a versatile, weatherproof solution designed for caravans and motorhomes. Measuring 19mm in width, it effectively seals overlap joints, awning rails, roof-lights, and more. With its durable formulation, this sealing strip ensures long-lasting protection against leaks and damage, making it a trusted choice for outdoor enthusiasts. Easy to apply and compatible with various surfaces, it empowers users to maintain their vehicles without professional assistance.

## Description

W4 Mastic Sealing Strip Grey – Waterproof Butyl Seal Tape for Roofs, Windows, Doors & Caravans, Flexible Weatherproof Adhesive Strip for Gap Filling, Leak Repair & DIY Applications (19mm) : desertcart.co.uk: DIY & Tools

## Features

- SUPERIOR WATERPROOF SEALING PERFORMANCE: W4 Mastic Sealing Strip provides a strong, long-lasting waterproof seal for roofs, windows, doors, caravans, and gutters. The high-quality butyl adhesive ensures excellent bonding to metal, glass, plastic, and wood surfaces, preventing leaks, drafts, and moisture damage in indoor and outdoor applications
- FLEXIBLE BUTYL TAPE FOR UNEVEN SURFACES: Designed with flexible mastic material, this sealing strip easily conforms to uneven, curved, or textured surfaces. Suitable for sealing gaps, joints, and seams, it maintains an airtight and watertight barrier even in challenging conditions for DIY repairs and professional use
- EASY PEEL AND STICK APPLICATION: This grey sealing strip is simple to install with a peel-and-stick backing, requiring no special tools or expertise. Cut to size for precise application on roofs, windows, caravans, or vents. Its user-friendly design makes it suitable for quick repairs, maintenance tasks, and long-term sealing projects
- WEATHERPROOF AND LONG-LASTING DURABILITY: Engineered to withstand harsh weather conditions, this butyl mastic strip resists UV rays, rain, wind, and temperature fluctuations. It remains flexible without cracking or shrinking over time, ensuring reliable performance for exterior and interior sealing tasks in all seasons
- MULTI-PURPOSE USE FOR HOME AND AUTOMOTIVE: Suitable for a wide range of applications including caravans, motorhomes, roofs, windows, doors, gutters, and vents. This versatile sealing tape offers a dependable solution for sealing, insulating, and protecting surfaces for DIY enthusiasts, tradespeople, and repair jobs
- GENEROUS DIMENSIONS FOR EXTENDED COVERAGE: Features a 45mm width and 5m length, providing ample coverage for larger areas while reducing the need for multiple joins. The non-setting formulation adapts to movement and weather conditions without drying out or cracking over time
- NO CURING TIME REQUIRED: Quick and easy to apply with no curing time needed, allowing for immediate use after installation. This feature makes it convenient for both emergency repairs and planned maintenance projects on caravans, motorhomes, and various building applications

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0036APFJM |
| Best Sellers Rank | 184,889 in DIY & Tools ( See Top 100 in DIY & Tools ) 414 in Sealing Tape |
| Brand | W4 |
| Colour | Grey |
| Customer Reviews | 4.5 4.5 out of 5 stars (431) |
| Global Trade Identification Number | 05019328000161 |
| Included Components | 1 x W4 Grey Mastic Tape Roll |
| Item Dimensions L x W | 19W millimetres |
| Item Thickness | 19 Millimetres |
| Item Type Name | W4 W4 Narrow Mastic Sealing Strip - 5m x 19mm - Off-White, |
| Item Weight | 0.49 Pounds |
| Manufacturer | W4 |
| Manufacturer Warranty Description | 1 year. |
| Material | Butyl |
| Model Number | W4 Mastic |
| Number of Items | 1 |
| Part Number | 00016 |
| Recommended Uses For Product | Sealing overlap joints, awning rails, roof-lights, vents, and window surrounds on caravans and motorhomes |
| Unit Count | 5.0 meter |

## Product Details

- **Brand:** W4
- **Colour:** Grey
- **Item thickness:** 19 Millimetres
- **Material:** Butyl
- **Product dimensions:** 19W millimetres

## Images

![W4 Mastic Sealing Strip Grey – Waterproof Butyl Seal Tape for Roofs, Windows, Doors & Caravans, Flexible Weatherproof Adhesive Strip for Gap Filling, Leak Repair & DIY Applications (19mm) - Image 1](https://m.media-amazon.com/images/I/61KH8go1V4L.jpg)
![W4 Mastic Sealing Strip Grey – Waterproof Butyl Seal Tape for Roofs, Windows, Doors & Caravans, Flexible Weatherproof Adhesive Strip for Gap Filling, Leak Repair & DIY Applications (19mm) - Image 2](https://m.media-amazon.com/images/I/71VOgnVhwmL.jpg)
![W4 Mastic Sealing Strip Grey – Waterproof Butyl Seal Tape for Roofs, Windows, Doors & Caravans, Flexible Weatherproof Adhesive Strip for Gap Filling, Leak Repair & DIY Applications (19mm) - Image 3](https://m.media-amazon.com/images/I/71jHaReWyLL.jpg)
![W4 Mastic Sealing Strip Grey – Waterproof Butyl Seal Tape for Roofs, Windows, Doors & Caravans, Flexible Weatherproof Adhesive Strip for Gap Filling, Leak Repair & DIY Applications (19mm) - Image 4](https://m.media-amazon.com/images/I/710ia+m-kSL.jpg)
![W4 Mastic Sealing Strip Grey – Waterproof Butyl Seal Tape for Roofs, Windows, Doors & Caravans, Flexible Weatherproof Adhesive Strip for Gap Filling, Leak Repair & DIY Applications (19mm) - Image 5](https://m.media-amazon.com/images/I/816wa3r1ntL.jpg)

## Available Options

This product comes in different **Style** options.

## Frequently Bought Together

- W4 Mastic Sealing Strip for Caravans & Motorhomesmm – Grey 19mm Weatherproof Sealant for Overlap Joints, Awning Rails, Roof-Lights, Window Surrounds & External Trims, Durable & Easy to Apply
- Sika Sikaflex-522 Caravan And Motorhome Adhesive Sealant – Weather And Mould Resistant – White – 300ml
- Roof Sky Light Caravan Motorhome 400 x 400mm Flynet White MPK Rooflight

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**Shop now:** [https://www.desertcart.hr/products/48713368-w4-mastic-sealing-strip-grey-waterproof-butyl-seal-tape-roofs](https://www.desertcart.hr/products/48713368-w4-mastic-sealing-strip-grey-waterproof-butyl-seal-tape-roofs)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-09-06*