---
product_id: 49495873
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 (32mm)"
brand: "w4"
price: "€ 35.48"
currency: EUR
in_stock: true
category: "W4"
url: https://www.desertcart.hr/products/49495873-w4-mastic-sealing-strip-grey-waterproof-butyl-seal-tape-roofs
store_origin: HR
region: Croatia
---

# Flexible & pliable Waterproof seal Instant adhesion 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 (32mm)

**Brand:** w4
**Price:** € 35.48
**Availability:** ✅ In Stock

## Summary

> 💧 Seal it once, forget leaks forever!

## 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 (32mm) by w4
- **How much does it cost?** € 35.48 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/49495873-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

- • **Flexible Fit:** Easily molds and compresses to fill gaps perfectly, no awkward edges.
- • **Instant Grip Power:** Super high adhesion on clean surfaces for quick, reliable fixes.
- • **Versatile Application:** Ideal for roofs, windows, doors, caravans, and all your DIY waterproofing needs.
- • **Watertight Confidence:** Zero leaks even after heavy rain – trust your projects to stay dry.
- • **Durable & Weatherproof:** Built to withstand outdoor elements with a 1-year manufacturer warranty.

## Overview

The W4 Mastic Sealing Strip Grey is a 32mm thick, flexible butyl adhesive tape designed for waterproof sealing and gap filling on roofs, windows, doors, and caravans. With instant adhesion and pliability, it ensures a watertight, durable seal that withstands harsh weather conditions, backed by a 1-year warranty and trusted by thousands of DIY pros.

## Description

Versatile sealing solution for caravan and motorhome fittings, providing a durable, weather-resistant, and long-lasting seal on various exterior surfaces.

## Features

- Great Product

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0036KG89I |
| Best Sellers Rank | 62,424 in DIY & Tools ( See Top 100 in DIY & Tools ) 885 in Sealers |
| Brand | W4 |
| Colour | Grey |
| Country of Origin | China |
| Customer Reviews | 4.6 out of 5 stars 769 Reviews |
| Global Trade Identification Number | 05019328000178 |
| Included Components | 1 x W4 Grey Mastic Tape Roll |
| Item Thickness | 32 Millimetres |
| Item thickness | 32 Millimetres |
| Manufacturer | W4 |
| Manufacturer Warranty Description | 1 year. |
| Material | Plastic |
| Model Number | 00017 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of items | 1 |
| Part Number | 00017 |
| Recommended Uses For Product | Caravan Maintenance, Motorhome Repair |
| Recommended uses for product | Caravan Maintenance, Motorhome Repair |
| Unit Count | 4 meter |

## Product Details

- **Brand:** W4
- **Colour:** Grey
- **Item thickness:** 32 Millimetres
- **Material:** Plastic

## 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 (32mm) - Image 1](https://m.media-amazon.com/images/I/71JksPgOMFL.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 (32mm) - 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 (32mm) - Image 3](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 (32mm) - Image 4](https://m.media-amazon.com/images/I/816wa3r1ntL.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 (32mm) - Image 5](https://m.media-amazon.com/images/I/710ARHxKiFL.jpg)

## Questions & Answers

**Q: Can someone please explain exactly how to use this to fix a leaky sunroof as i cant find any answers on google**
A: Had the same problem with the fan on my van. I took it off and removed all the old sealing first, gave it a good clean and then I marked the outline of the fan on the roof. I then put the sealing tape around these lines like a frame. I used 3 layers and had the edges overlapping to make sure there's not the slightest gap between. After the fan was put in place and the screws were in I sealed the outline with Sikaflex. Worked perfectly and it is 100% waterproof since. I hope this will answer your question and I also hope you understand my description.

**Q: How thick is it**
A: The grey sealing strip is 30 mm wide, 2mm thick on a roll

Eric

**Q: Is this just fora moterhome or can I use it in the house?**
A: Hi,
You can use this around the house, we have kitchen fitters using this to seat kitchen sinks and hobs down with it.

**Q: Is it supplied in black**
A: Hi,
No its not supplied in black im afraid.

## Frequently Bought Together

- W4 Mastic Sealing Strip for Caravans & Motorhomesmm – Grey 32mm Weatherproof Sealant for Overlap Joints, Awning Rails, Roof-Lights, Window Surrounds & External Trims, Durable & Easy to Apply
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- Caravan Roof Vent Fan, RV Air Vent Ventilation with Rain Sensor, Automatic Level Permanent Reversible Fan 12V for RV Motorhome (14" Black Translucent- Air Max Ultra Quiet-12 volt Fan)

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**Shop now:** [https://www.desertcart.hr/products/49495873-w4-mastic-sealing-strip-grey-waterproof-butyl-seal-tape-roofs](https://www.desertcart.hr/products/49495873-w4-mastic-sealing-strip-grey-waterproof-butyl-seal-tape-roofs)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-09-17*