10 Best Black Waterproof Sealant in The UK

Last updated on 11/08/2025

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Gorilla Waterproof Black Coat & Seal Spray, 450ml – Flexible, Weatherproof Liquid Sealant | Seals out Water, Air & Moisture | For Roof Tiles, Brick, Wood, Metal, Concrete, Stone, Rubber, Plastics*

22% OffFree Shipping

Why We Love It

Flexible, weatherproof protective spray.
Effective against various elements.
Indoor, outdoor applicability.

Main Highlights

FLEXIBLE & WEATHERPROOF: Gorilla Waterproof Coat & Seal Spray offers durable protection with its flexible and weatherproof formula, ensuring reliable defense against the elements for various surfaces and applications.
SEALS OUT WATER, AIR & MOISTURE: Effectively seals out water, air, and moisture, providing robust defense against the elements for long-lasting durability and reliability. Once cured, the product is weatherproof and temperature resistant.
INDOOR & OUTDOOR: Suitable for both indoor and outdoor use, offering reliable protection against water, air, and moisture for various surfaces and environments. Can be used for sealing small cracks indoor and out.
GREAT FOR: Perfect for roofing, gutters, downpipes, windows/uPVC, external chimneys, and small repairs on caravans, providing effective sealing and protection. Not for flashing applications, pipes under pressure or for use inside firebox.

XFasten Silicone Sealant Waterproof Black Cartridge, 10.1 oz (Single Pack) Black Caulking Silicone Adhesive Sealant Cartridge for RV, General Use, Window, Door, Glass, Automotive Leak Sealing

4% OffFree Shipping

Why We Love It

Weatherproof protection against elements.
Long-lasting 15 years protection.
Easy and smooth application.

Main Highlights

INDUSTRIAL-GRADE WEATHERPROOF black silicone sealant that offers maximum protection against water damage, leaks, drips, UV, extreme heat, and pressure for both indoor and outdoor environment on most surfaces like metal, granite, stone, wood and glass.
RATED TO PROTECT UP TO 15 YEARS. This black silicone sealant adhesive is laboratory tested and rated to provide protection against dark spots, stains and other damage and stains caused by weather, water leaks, drips and heat.
EASY TO APPLY BLACK SILICONE CAULK CATRIDGE. The XFasten Waterproof Black Silicone Caulk is packed inside a high-pressure resistant cartridge that is equipped with a jam-resistant nozzle for easy and smooth application.
QUICK SETTING AND CURING. Do you need to quickly fix a leak on your door or shower glass? We got you covered! The XFasten Silicone sealant waterproof cartridge dries, sets and cures in 30 minutes and is ready to be exposed under the scorching heat or heavy rain.
DOES NOT SHRINK AND CRACK. With excellent adhesion, maximum flexibility and superior sheer stress resistance, our waterproof black silicone caulk will not shrink or crack even if constantly exposed under freezing temperatures, UV from scorching sunlight, or constant rain water drips.

Ganbaro Black Silicone Sealant 100 ml, Waterproof, High Temperature, Multi-Purpose for Cars, Windows, Roofs

Free Shipping

Why We Love It

High-quality and weather-resistant.
Easy for anyone to apply.
Safe and eco-friendly.

Main Highlights

Upgraded sealant: During the upgrade process of car sealant, it will be shipped in boxed form. The car body sealant is made of high-quality materials and has excellent weather resistance and anti-aging properties. It can still maintain its original elasticity and sealing performance under various harsh climate conditions. Please squeeze the tail pipe gently when using it, and do not use too much force to avoid breaking the tube.
Easy to use: The car body sealant is simple in design and easy to use, and you can easily complete the sealing work without professional skills. Just apply the sealant to the area to be sealed and wait for a while to form a firm seal.
Fast curing: This black sealant cures quickly and can form a strong sealing layer in a few minutes, allowing you to complete the sealing work in a short time, saving time and energy.
Safe and environmentally friendly: The car window sealant is made of safe and environmentally friendly raw materials. The use process is safe and odorless, and has no effect on the human body and the environment.
Multi-purpose application: This black car sealant is suitable for all types of car sealing and repair work, including doors, windows, hoods, trunks, etc. Whether you need to repair water leaks, air leaks or sound insulation, this sealant can provide you with a perfect solution.

Hemway - Construction All-In-One Hybrid Polymer Sealant & Adhesive - Jet Black | Anti-Mould, Waterproof & Paintable | 300 ml

23% OffFree Shipping

Why We Love It

Mould resistant and waterproof.
Flexible and ultra-high strength.
Odourless and environmentally friendly.

Main Highlights

HYBRID POLYMER TECHNOLOGY: All-in-one technology combines the flexibility of silicone, with the paintability of acrylic caulk & the high-strength seal of adhesives; ideal for construction, renovation, finishing & fixing. Hemway is a British brand and we manufacture our products to the highest standards of quality.
VERSATILE USE: Delivers a jet black finish on wood, glass, plastic, metal, PVC & concrete, plus compatible with water-based paints; an ideal floor, tile, bath, window, wall, door, shower, toilet, roof & gutter leak sealant..
ANTI-MOULD & WATERPROOF: Our unique non-shrink formula is anti-mould, waterproof, weatherproof, chemical & UV resistant, offering a durable, long-lasting finish that is resistant against fading & stains.
ECO-FRIENDLY: This vegan & cruelty-free adhesive & sealer is more environmentally safe than other silicone alternatives; a solvent-free, odourless, non-toxic & low VOC product.
QUICK CURE & HIGH COVERAGE: Covers a 6 mm bead x 9.25 mm length & fast curing within 24 hours at 23°C, with 50% R/H; provides resistance from -50°C to 120°C, making it suitable for many conditions, including high-humidity areas.

Hemway 300 ml Jet Black Hybrid Polymer Sealant | Odourless & Sanitary Anti-Mould Adhesive | Waterproof & Suitable For Use in Kitchen, Bathroom & Around Bath, Shower & Toilet | Easy To Use - 1 Pack

23% OffFree Shipping

Why We Love It

Mould resistant and waterproof.
Advanced polymer formulation.
Odourless and non-toxic.

Main Highlights

MOULD RESISTANT & WATERPROOF: Ideal for use in kitchens, bathrooms & areas of high humidity; anti-mould, waterproof, non-shrink & stain resistant properties are suitable for tiles, walls, baths, window frames, showers, toilets, sinks, door frames, worktops, concrete, metal, wood, most plastics & synthetic fibres.
ADVANCED HYBRID POLYMER: This sealant combines the flexibility of silicone, paintability of acrylic caulk & high grab strength of adhesives; it can be applied underwater without releasing plasticisers.
CHEMICAL & UV RESISTANT: The durable properties of the sealant provides a long lasting finish that provides resistance to fading, stains & chemicals.
EASY TO USE: Our sealant is made to be used with ease, manually with a sealant gun or caulking gun; it has a coverage of approximately 9.25 m x 3 mm bead & a quick curing time of 24-48 h depending on bead size, room temperature & humidity.
ECO FRIENDLY: Odourless, solvent-free & non-toxic; no bad smells, dangerous chemicals or sticky residue & ultra low VOC rate; safe for use around the house.

Sika Stixall – Extreme Power Sealant And Adhesive – Waterproof – Black – 290ml

6% Off

Why We Love It

High grab strength, zero sagging.
Weather and water-resistant.
Bonds underwater or in rain.

Main Highlights

HIGH-PERFORMANCE – Crafted using hybrid polymer technology, it has incredible initial grab strength, zero sagging and fills gaps with ease.
IDEAL FOR INTERIOR AND EXTERIOR USE DEPENDING ON THE APPLICATION – Resistant to weather, water, temperature and chemicals, you can use this as an adhesive inside and out plus as an interior sealant. (NOTE: Crystal Clear colour is not suitable for exterior use)
VERSATILE – Has incredible high-grab adhesion to a wide range of materials, including glass, metals, plastic, concrete, wood, and so much more – it bonds even underwater or in the rain.
PROFESSIONAL FINISH – This quick-curing mix develops a skin in only 10 minutes and is paintable once completely dry with water-based paints for a high-quality finish to your DIY projects.
EASY TO APPLY – Insert the cartridge into your caulking gun, snip the tip and apply as needed to your chosen materials.
LONG-LASTING – This completely waterproof adhesive and sealant is resistant to temperature extremes between -40°C and +100°C, as well as a range of chemicals once fully cured, meaning it can be considered for durable applications.
MULTIPLE COLOURS – Available in Black, Brown, Anthracite, White, Crystal Clear and Grey

Bond-It GP200 Contractors Grade LMA General Purpose Acetoxy Silicone Sealant With Fungicide Black, 275ml

14% Off

Why We Love It

Ideal for sanitary use.
Mould and fungal resistant.
Fast and easy setting.

Main Highlights

Ideal For Sanitary Use
Mould and Fungal Resistant
Inddor and Outdoor Use
Fast Setting

professional soma fix

Silicone Sealant - Flexible Silicone Tube for Wood, Parquet, Bathroom, Sink, Windows - Multi-Purpose, Waterproof (Black, 50ml)

15% OffFree Shipping

Why We Love It

No mess application process.
Ideal for wood projects.
Mould-resistant for clean surfaces.

Main Highlights

NO SILICONE GUN NEEDED - 50ml silicone tube for quick, mess-free application. Perfect as bathroom sealant, kitchen sealant, shower sealant, window sealant, sink sealant, aquarium sealant, bath sealant and more
EXCELLENT FOR WOOD APPLICATIONS - Silicone sealant has outstanding performance in bonding parquet, mounting wood panels, doors, windows, mouldings, and decorative timbers. Also ideal for use on wooden furniture, cupboards, wardrobes, and staircases
RELIABLE SEAL FOR EVERYDAY USE - Provides a tight, water-resistant seal for general indoor applications, helping surfaces stay clean and protected longer
100% WATERPROOF & FLEXIBLE - Silicone tube provides a strong, watertight seal that stays flexible, perfect for kitchens, bathrooms, sinks, trays, showers, and wet rooms
LOW SHRINKAGE - Mastic sealant has low shrinkage (<15%) and smooth appearance make it suitable for high-end DIY projects and visible areas

V-Tech VT-131 Quality Auto Sealer Silicone Adhesive Sealant: 75gm Windscreen

Free Shipping

Why We Love It

Waterproof and flexible seal.
Suitable for all surfaces.
Does not dry out.

Main Highlights

general purpose, black coloured silicone sealant for both indoor and outdoor applications.
can be applied to horizontal or vertical surfaces and provides a waterproof and flexible seal
It does not dry out or become brittle.
can be used to seal, bond, repair or secure

EVO-STIK All Purpose Silicone Sealant, Flexible, Suitable for a Host of Different Applications, Colour: Black

28% OffFree Shipping

Why We Love It

Flexible for various applications.
Resistant to mould and weather.
High quality with 25-year guarantee.

Main Highlights

EVO-STIK ALL PURPOSE SILICONE SEALANT – high quality, flexible sealant with excellent weather, sunlight and mould resistance
USES - Can be used to seal anything from door and window frames to baths, showers and sinks
WEATHER RESISTANT - Suitable for interior and exterior use
MOULD RESISTANT - Easy to clean with a 25-year guarantee
CONTENTS - 1x EVO-STIK All Purpose Silicone Sealant, High Quality, Flexible, Suitable for a Host of Different Applications, Colour: Black

8.7

Excellent

Save 28%

We scanned 1656 products

We reviewed these offers relevant to the Black Waterproof Sealant within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Gorilla, XFasten, Ganbaro, Hemway, Sika, Bond It, professional soma fix, Hasbro, EVO-STIK, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Black Waterproof Sealant in the market, we considered we took a deep dive into 8281 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Gorilla Waterproof Black Coat & Seal Spray, 450ml – Flexible, Weatherproof Liquid Sealant | Seals out Water, Air & Moisture | For Roof Tiles, Brick, Wood, Metal, Concrete, Stone, Rubber, Plastics*. We love many things about this product by Gorilla. What sets it apart from the competition is Flexible, weatherproof protective spray, Effective against various elements, Indoor, outdoor applicability.
The best value product for most shoppers and where user satisfaction is continuously the highest is XFasten Silicone Sealant Waterproof Black Cartridge, 10.1 oz (Single Pack) Black Caulking Silicone Adhesive Sealant Cartridge for RV, General Use, Window, Door, Glass, Automotive Leak Sealing by XFasten based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Black Waterproof Sealant and the best cost-to-value ratio is EVO-STIK All Purpose Silicone Sealant, Flexible, Suitable for a Host of Different Applications, Colour: Blackat EVO-STIK with a 28% discount.
Our list of the best Black Waterproof Sealant is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Black Waterproof Sealant in The UK

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We scanned 1656 products

We concluded that: