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Water Leak Sealant Comparison - July 2025

7 Best Water Leak Sealant In the UK

Last Updated - 06/07/2025

Advertising Disclosure

Our Score

To Amazon

View DealOn Amazon

Model

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

Model

Kudos-Trading - Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g Plumbers Pipe Fitters DIY plumbers mait

Model

Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)

Model

Model

EVO-STIK Plumber's Mait Quick Leak Repair Putty, Instant Repairs for Pipes, Radiators, Tanks & Cylinders, Waterproof, 50g

Model

300g Invisible Waterproof Anti-Leaking Sealant, Transparent Coating for Insulation, Tile Trapping Repair and Wall Mending - Home Roof Bathroom

Model

ZOPPER 400ml Leak Repair Spray Black | Seals Leaks all Around Home Ideal for Piping, Drains Windows, Roofs and Guttering - Waterproof, Paintable & Flexible

Brand

Polar Specialist Coatings

Brand

Kudos-Trading

Brand

Pro-Kleen

Brand

Duck

Brand

EVO-STIK

Brand

Heyzeibo

Brand

ZOPPER

Reviews

13,214 reviews

Reviews

206 reviews

Reviews

896 reviews

Reviews

2,848 reviews

Reviews

4,366 reviews

Reviews

216 reviews

Reviews

Features

Simple to use

9.4

Simple to use

9.4

Simple to use

9.1

Simple to use

8.4

Simple to use

7.9

Simple to use

7.2

Simple to use

7.0

Attachment

9.1

Attachment

9.1

Attachment

9.1

Attachment

8.6

Attachment

7.2

Attachment

7.0

Attachment

7.0

Tech Specs

item weight

396 g

item weight

70 g

item weight

400 g

item weight

60 g

item weight

50 g

item weight

300 g

item weight

customer reviews

4.2 4.2 out of 5 stars 6, 607 ratings 4.2 out of 5 stars

customer reviews

4.1 4.1 out of 5 stars 103 ratings 4.1 out of 5 stars

customer reviews

4.1 4.1 out of 5 stars 448 ratings 4.1 out of 5 stars

customer reviews

4.1 4.1 out of 5 stars 1, 424 ratings 4.1 out of 5 stars

customer reviews

3.8 3.8 out of 5 stars 2, 183 ratings 3.8 out of 5 stars

customer reviews

4.0 4.0 out of 5 stars 108 ratings 4.0 out of 5 stars

customer reviews

batteries required

color

Clear

color

Yellow White

color

Clear

color

Black

color

Resin: Dark Copper. Hardener: Pale Grey

color

Black

product dimensions

18 x 7 x 18 cm 396.89 g

product dimensions

14.2 x 3.8 x 2.8 cm 70 g

product dimensions

20 x 7 x 7 cm 400 g

product dimensions

3.1 x 10.8 x 16.5 cm 60 g

product dimensions

11.4 x 3 x 20.3 cm 50 g

product dimensions

material

Plastic

material

Acrylic

material

Silicone

material

Epoxy Putty

material

Rubber

material

style

Compact

style

Brass

style

Single

style

Compact

style

Compact

item package quantity

included components

Pro-Kleen Instant Waterproof Sealant Spray

included components

A Roll of Duck Wrap Fix

included components

1x EVO-STIK Plumber's Mait Quick Leak Repair Putty, 50g

included components

manufacturer reference

1128

manufacturer reference

Sealant AgentQAZ001

manufacturer reference

ZLS-001

size

400 ml Pack of 1

size

400 ml

size

25mm x 3m

size

Available On

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Our Top 3 Picks

Here are the top 3 recommended products with more information to help you find the right product for you

9.8
1

Polar Specialist Coatings
Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

9.4 Simple to use

9.1 Attachment

Why we love it

Instant waterproof sealing.

Long-lasting protection.

Versatile for multiple surfaces.
Main highlights

Quick and Easy Application: Our clear leak sealer spray offers a hassle-free solution for repairs. With its convenient spray format, it's as simple as point and spray. Whether it's a gutter, roof, or window, our waterproofing spray gets to work immediately, delivering a seamless seal that lasts. Ideal for both DIY enthusiasts and professionals.
Professional-Grade Performance: Enjoy outstanding efficacy with our roof sealant spray. Its easy-to-use design covers up to 2m² per 400ml can and requires 2-3 coats with a 20 minutes drying time between application. Perfect for quick fixes, it saves time and effort.
Long-Lasting Protection: Experience peace of mind knowing your surfaces are well-protected. Our leak sealer withstands all weather conditions, offering reliable defence against rain, UV rays, and temperature changes. Suitable for a wide range of surfaces, it delivers exceptional durability for both emergency and routine repairs.
Ideal For Emergency Fixes: This spray sealant for water leaks boasts versatile application, making it suitable for a wide range of surfaces such as concrete, brickwork, and metal. Rainfall immediately after application has no adverse effect, making it an excellent solution for urgent repairs in any weather condition. Please note, it is not suitable for use on bird baths, ponds or copper surfaces.
Advanced Waterproofing Solution: Polar Clear LeakFix spray is an innovative waterproof sealant spray designed to address fine leaks and cracks effectively. Its rubberised protective formula provides dependable protection against water damage, ensuring long-lasting results on various surfaces including flat roofs, gutters, and external pipes.
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9.6
2

Kudos-Trading
Kudos-Trading - Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g Plumbers Pipe Fitters DIY plumbers mait

9.4 Simple to use

9.1 Attachment

Why we love it

Safe for drinking water systems.

Withstands high temperatures and pressures.

Eco-friendly and non-toxic formula.
Main highlights

Safe for use with potable water systems: fernox Ls-X is formulated to be safe for use in drinking water systems, making it an ideal solution for sealing leaks in domestic water pipes and fittings, without posing any health risks.
Rapid sealing action: fernox Ls-X external leak sealer is designed to quickly and effectively seal small weeping joints, leaks, and pinholes in pipework systems, offering an immediate solution to prevent further water damage.
Non-toxic and environmentally friendly: the fernox Ls-X external leak sealer is a non-toxic and eco-friendly solution, ensuring that it does not harm the environment or pose any health risks to humans or animals.
Long shelf life: the fernox Ls-X leak sealer offers a long shelf life, ensuring that it remains effective even when stored for extended periods, allowing users to keep a tube handy for future emergencies or repairs.
Heat and pressure resistant: the fernox Ls-X leak sealer is capable of withstanding high temperatures (up to 194°F or 90°C) and pressures (up to 58 psi or 4 bar), ensuring a long-lasting and durable seal in demanding environments.
Easy to apply and mess-free: the fernox Ls-X external leak sealer is simple to apply directly from the tube, ensuring a hassle-free process. Its non-drip formula ensures minimal mess during application, allowing for a clean and efficient repair job.
Compatible with various materials: the versatile formula of fernox Ls-X ensures compatibility with a wide range of materials, including copper, brass, steel, plastics, and ceramics, making it suitable for use in a variety of applications.
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9.4
3

Pro-Kleen
Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)

9.1 Simple to use

9.1 Attachment

Why we love it

Easy to use in emergencies.

Dries completely waterproof.

Remains flexible for years.
Main highlights

WATERPROOF FORMULA: The watertight formula dries completely waterproof. It’s super tough and robust, making it perfect for indoor and outdoor use. Whether you’re needing to fix a leaking roof or window – this is the product for you!
TRANSPARENT FORMULA: There’s no need to worry about Pro-Kleen’s sealant spray leaving behind an unappealing mark as it dries completely transparent. This means you can use it on with complete peace of mind
STOPS LEAKS AND DRIPS: Our easy to use sealant spray stops leaks and drips with ease. It’s an easy to use formula that’s perfect to use for emergencies when you need to stop leaks quickly. Whether you have a leak in your guttering, pipework, drain and much more, this Pro-Kleen leak sealer provides a trustworthy and easy solution to seal the leak quickly and efficiently
SAFE FOR A VARIETY OF SURFACES: This versatile formula is suitable for using on guttering, pipework, drains, windows, roofs and other leaking areas. Use our pipe sealant spray for a quick and easy fix for those pesky leaks and drips on a variety of indoor and outdoor surfaces
REMAINS FLEXIBLE AND PLIABLE FOR YEARS TO COME: Once dry, this sealant spray remains flexible and pliable for years to come! The formula is super long-lasting to prevent drips and leaks from returning after use
EASY TO USE FORMULA: For best results, we recommend applying to clean, dry surfaces that are free from dust, dirt and rust. 1. Spray in thin coats until you have the desired thickness. 2. We recommend plugging larger holes and voids with Aluminium foil before spraying to obtain a better seal. 3. Masking tape can be used to prevent the product from going onto other areas. If in doubt, spray the product in an inconspicuous area first. Use the product in well-ventilated areas only. After use, invert the can and spray to clear the nozzle to prevent blockages
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Our ranking system

The TopChoice.co.uk Team selects top-of-the-line items from a wide selection and conducts rigorous evaluations on almost all the products available on the internet. We rank each product based on how well it matches our criteria.
We can ensure that the product is well-tested with the help of our expertise, experts, and artificial intelligence technology. TopChoice.co.uk requires consistent care for the products we review, ensuring that our assessments are always accurate and up to date.

Features

Our team of experts analyzes key attributes, capabilities, significance, and many more depending on the type of product to determine its effectiveness.

Consumer Reviews

We ensure an evaluation of the ratings using references all over the internet for each product. With the help of our AI technology and professional review teams, we give weight to the worth of individual user experiences.

Popularity

Popularity is an important criterion in choosing a product. Several factors contribute to the popularity of the products on our site, including prestige, relevance, reputation, news, and more.

Value for money

TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.

When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.

7 Best Water Leak Sealant In the UK

Our Score

To Amazon

Model

Brand

Reviews

Features

Simple to use

Attachment

Tech Specs

item weight

customer reviews

batteries required

color

product dimensions

material

style

item package quantity

included components

manufacturer reference

size

Available On

Our Top 3 Picks

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

Why we love it

Kudos-Trading - Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g Plumbers Pipe Fitters DIY plumbers mait

Why we love it

Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)

Why we love it

Our ranking system

Features

Consumer Reviews

Popularity

Value for money

Value for money

Related deals you might like for water leak sealant

300g Invisible Waterproof Sealant, Anti-Leaking Clear Insulation Sealant Super Strong Anti-Leakage Agent, For Roof,Bathroom, Patio Sealer Outdoor, Indoor

Super Waterproof Tape - Butyl Sealing Outdoor Leak Repair and Seal Strip, for Roof Leak, Surface Crack, Window Sill Gap, Pipe Rupture, Aluminum Foil with Strong Rubber

Silicon SEALANT Clear Tube 70G

7 Best Water Leak Sealant In the UK

water leak sealant comparison

Our Score

To Amazon

Model

Brand

Reviews

Features

Simple to use

Attachment

Tech Specs

item weight

customer reviews

batteries required

color

product dimensions

material

style

item package quantity

included components

manufacturer reference

size

Available On

Our Top 3 Picks

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

Why we love it

Kudos-Trading - Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g Plumbers Pipe Fitters DIY plumbers mait

Why we love it

Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)

Why we love it

Our ranking system

Features

Consumer Reviews

Popularity

Value for money

Value for money

Related deals you might like for water leak sealant

300g Invisible Waterproof Sealant, Anti-Leaking Clear Insulation Sealant Super Strong Anti-Leakage Agent, For Roof,Bathroom, Patio Sealer Outdoor, Indoor

Super Waterproof Tape - Butyl Sealing Outdoor Leak Repair and Seal Strip, for Roof Leak, Surface Crack, Window Sill Gap, Pipe Rupture, Aluminum Foil with Strong Rubber

Silicon SEALANT Clear Tube 70G

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