---
product_id: 49495873
title: "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: "VT12878"
currency: VUV
in_stock: true
reviews_count: 11
category: "W4"
url: https://www.desertcart.vu/products/49495873-mastic-sealing-strip-grey-waterproof-butyl-seal-tape-for-roofs
store_origin: VU
region: Vanuatu
---

# Easy cut-to-fit flexibility Weatherproof & UV resistant 32mm thick durable seal 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:** VT12878
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal your adventures with confidence—because your rig deserves the best!

## Quick Answers

- **What is this?** 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?** VT12878 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/49495873-mastic-sealing-strip-grey-waterproof-butyl-seal-tape-for-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

- • **Built to Last:** Resists temperature swings and harsh conditions without losing grip
- • **DIY-Ready Application:** Cut to length and apply with ease—no expert skills needed
- • **Multi-Surface Mastery:** Bonds securely to metal, plastic, glass, and rubber
- • **Precision Fit Every Time:** Flexible strip conforms to curves and corners effortlessly
- • **Unmatched Weather Defense:** Seals out water, dust, and UV damage for year-round protection

## Overview

The W4 Mastic Sealing Strip is a 32mm thick, grey weatherproof sealant designed for caravans and motorhomes. It offers exceptional adhesive strength across multiple surfaces including metal, plastic, glass, and rubber. Engineered to resist UV rays, water, dust, and temperature fluctuations, this durable strip ensures a long-lasting, flexible seal ideal for overlap joints, awning rails, roof-lights, window surrounds, and external trims. Easy to cut and apply, it’s the go-to solution for reliable waterproofing and protection on the move.

## Description

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

Review: Strong and Reliable - I recently purchased the W4 High Performance Mastic Sealing Strip, and I must say it has proven to be an excellent product. This short review aims to highlight the strength and reliability of this sealing strip based on my experience. The W4 High Performance Mastic Sealing Strip offers exceptional strength when it comes to sealing various surfaces. Whether I'm working on my caravan, motorhome, or any other application that requires a reliable seal, this product delivers outstanding performance. One of the standout features of this sealing strip is its remarkable adhesive strength. It securely bonds to different materials, including metal, plastic, glass, and rubber, ensuring a tight and long-lasting seal. The strip creates a barrier against water, dust, and other contaminants, providing added protection and durability. The sealing strip's high-performance mastic material is resistant to harsh weather conditions, UV rays, and temperature fluctuations. This resilience allows it to maintain its strength and effectiveness over time, making it suitable for both indoor and outdoor applications. It provides peace of mind, knowing that the seal remains intact even in challenging environments. Furthermore, the W4 High Performance Mastic Sealing Strip is easy to use. It can be cut to the desired length and applied directly to the intended area. The strip conforms well to irregular surfaces, ensuring a complete and secure seal. Its flexibility allows for easy installation around corners and curves without compromising its strength. The versatility of this sealing strip is worth mentioning as well. It can be used in various applications, including sealing joints, filling gaps, and preventing leaks. Whether it's for automotive purposes, household repairs, or DIY projects, the W4 High Performance Mastic Sealing Strip proves to be a reliable and multipurpose solution. In conclusion, the W4 High Performance Mastic Sealing Strip is a must-have for anyone in need of a strong and reliable seal. Its impressive adhesive strength, durability, and versatility make it a valuable addition to any toolkit or repair supplies. If you're looking for a sealing strip that offers exceptional strength and reliability, look no further. The W4 High Performance Mastic Sealing Strip will exceed your expectations and provide a long-lasting seal in various applications.
Review: Works well - Brilliant product, used for levelling electric fan on my campervan roof, not a leak in sight

## Features

- Great Product

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0036KG89I |
| Best Sellers Rank | 17,721 in DIY & Tools ( See Top 100 in DIY & Tools ) 346 in Sealers |
| Brand | W4 |
| Colour | Grey |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,606) |
| Global Trade Identification Number | 05019328000178 |
| Included Components | Side Handle |
| Item Thickness | 32 Millimetres |
| Manufacturer | W4 |
| Material | Plastic |
| Recommended Uses For Product | Waterproofing, re-bedding and waterproofing of external components on recreational vehicles and camping equipment |
| Unit Count | 5.0 meter |

## Product Details

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

## Images

![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)

## Available Options

This product comes in different **Color, Size** options.

## 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Strong and Reliable
*by K***S on 23 June 2023*

I recently purchased the W4 High Performance Mastic Sealing Strip, and I must say it has proven to be an excellent product. This short review aims to highlight the strength and reliability of this sealing strip based on my experience. The W4 High Performance Mastic Sealing Strip offers exceptional strength when it comes to sealing various surfaces. Whether I'm working on my caravan, motorhome, or any other application that requires a reliable seal, this product delivers outstanding performance. One of the standout features of this sealing strip is its remarkable adhesive strength. It securely bonds to different materials, including metal, plastic, glass, and rubber, ensuring a tight and long-lasting seal. The strip creates a barrier against water, dust, and other contaminants, providing added protection and durability. The sealing strip's high-performance mastic material is resistant to harsh weather conditions, UV rays, and temperature fluctuations. This resilience allows it to maintain its strength and effectiveness over time, making it suitable for both indoor and outdoor applications. It provides peace of mind, knowing that the seal remains intact even in challenging environments. Furthermore, the W4 High Performance Mastic Sealing Strip is easy to use. It can be cut to the desired length and applied directly to the intended area. The strip conforms well to irregular surfaces, ensuring a complete and secure seal. Its flexibility allows for easy installation around corners and curves without compromising its strength. The versatility of this sealing strip is worth mentioning as well. It can be used in various applications, including sealing joints, filling gaps, and preventing leaks. Whether it's for automotive purposes, household repairs, or DIY projects, the W4 High Performance Mastic Sealing Strip proves to be a reliable and multipurpose solution. In conclusion, the W4 High Performance Mastic Sealing Strip is a must-have for anyone in need of a strong and reliable seal. Its impressive adhesive strength, durability, and versatility make it a valuable addition to any toolkit or repair supplies. If you're looking for a sealing strip that offers exceptional strength and reliability, look no further. The W4 High Performance Mastic Sealing Strip will exceed your expectations and provide a long-lasting seal in various applications.

### ⭐⭐⭐⭐⭐ Works well
*by F***1 on 23 October 2025*

Brilliant product, used for levelling electric fan on my campervan roof, not a leak in sight

### ⭐⭐⭐⭐ Good all rounder
*by J***S on 15 May 2023*

Protecting paper peels off nicely. Adds too easy handling. Can get messy if this is not the case. Good all round tape. Cannot comment on adhesive quality as i HAVE ONLY JUST PUT IT ON, Looking as if it will last though.

## 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
- Sika Sikaflex-522 Caravan And Motorhome Adhesive Sealant – Weather And Mould Resistant – White – 300ml
- 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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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-17*