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10 Best External Clear Silicone Sealant Waterproof in The UK

Last updated on 07/07/2025

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Best Choice

Unibond Outdoor Extreme Repair - Translucent 294g

27% OffFree Shipping

Why We Love It

Highly durable and resilient.
Ideal for all weather.
Superior wet surface adhesion.

Main Highlights

Bonding & Sealing - This premium polymer-based sealant is suitable for bonding and sealing joints indoors and outdoors. Ideal for windows, doors, and facades
Durable - This waterproof and weather-resistant joint sealant cures in approximately 24 hours. Suitable for indoor and outdoor use achieving long-lasting results
Wet surface adhesion - When fully cured, this polymeric sealant is highly resilient and it provides stronger adhesion to a wide range of damp and wet surfaces than silicone sealants
Polymer technology - Thanks to unique technology, the joint filler is impact and shock-resistant for the toughest repair jobs, and will not shrink over time

UniBond Anti-Mould White, Waterproof Mould Protection, Long-lasting White Silicone Sealant for Kitchen & Bathroom, Powerful Bath Sealant, 1 x 274g Cartridge

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Why We Love It

Mould resistant, strong and flexible.
Ideal for humid environments.
Easy and quick application.

Main Highlights

Anti mould sealant - Once dry, the UniBond sealant forms a permanently flexible, mould resistant & waterproof sealant, ensuring strong seals and preventing mould growth.
Specially formulated - The formula of this shower sealant is ideal for warm and humid environments such as bathrooms, kitchens and other tiled areas or surfaces.
High adhesion - Create a perfect and long-lasting seal with this durable, high-strength kitchen sealant. Ensure a mould free finish with regular cleaning of the sealant.
Easy-to-use - Complete your jobs quickly: after applying with a gun, the white kitchen silicone seal is 'touch dry' within just 20 minutes and fully dry within 24 hours.
Practical Delivery - UniBond Anti-Mould White, sanitary sealant for kitchens & bathrooms preventing mould growth, silicone acetoxy formula, white, 1 x 274g Cartridge

Hemway - Construction All-In-One Hybrid Polymer Sealant & Adhesive - Crystal Clear | Transparent, Anti-Mould, Waterproof & Paintable | 300 ml

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Why We Love It

Resistant to Mould and Water.
Advanced, High-Grab Polymer Formulation.
Eco-friendly and Fast Curing.

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 crystal clear, transparent 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.

Everbuild 4 X General Purpose Silicone Clear 310ml EVBGPSCL

32% Off

Why We Love It

Energy-efficient and eco-friendly solutions.
Boosts efficiency and durability.
Innovative products since 1927.

Main Highlights

WATERPROOF SEAL - Provides a strong waterproof seal in kitchens and bathrooms around sinks, showers, baths, toilets, work surfaces, and laminates.
ANTI-FUNGAL - Includes anti-fungal ingredients for mould prevention in high-humidity areas like bathrooms and kitchens.
VERSATILE - This adaptable sealant can be used as an adhesive to secure PVCu trims, cladding, and panels.
CERTIFIED - Meets the European standard EN15651 for façade, cold climate and sanitary applications in compliance with the Construction Product Regulation.
EASY TO APPLY - Apply using a caulk, sealant/adhesive cartridge application gun such as the Everbuild Power Pro Heavy Duty Sealant / Professional Sealant Gun

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

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Why We Love It

Instant, thorough waterproof sealing.
Long-lasting protective formula.
Extremely user-friendly application.

Main Highlights

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.
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.
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.
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.

Gorilla 1144110 All Conditions Sealant Silicone Clear 295ml

55% OffFree Shipping

Why We Love It

Fast set in 30 minutes.
Repels mold and mildew.
Works on multiple surfaces.

Main Highlights

FAST SET - Can be exposed to water after just 30 minutes
REPELS MOULD & MILDEW - Long lasting performance
MULTI SURFACE - For use on Porcelain, Metal, Vinyl, Laminate, Stone, Ceramic, Stainless Steel, Granite, Wood, Glass
DURABLE FORMULA - Won't yellow, shrink or crack over time
PREPARATION: All surfaces should be clean, dry and free of old sealant. For gaps larger than 12 mm, use a backer rod to fill the gap. Best results achieved if applied above 5°C.

EVO-STIK Multipurpose Silicone Sealant, Waterproof + Mould Resistant, for Interior and Exterior Use, Colour: Clear

Free Shipping

Why We Love It

Mould resistant for longevity.
Versatile for various surfaces.
Clear finish looks clean.

Main Highlights

EVO-STIK Multipurpose Silicone Sealant, High quality, waterproof sealant that does not crack, shrink or discolour
Suitable for interior and exterior use
No more unsightly mould – Contains a fungicide to inhibit mould growth
Suitable materials: Non-porous surfaces – glass, stainless steel, ceramics, plastic baths and fittings, vitreous enamel, gloss painted surfaces and more
Contents: 1x EVO-STIK Multipurpose Silicone Sealant, Waterproof + Mould Resistant, For Interior and Exterior Use, Colour: Clear
Excellent adhesion to most surfaces
Waterproof and mould resistant
Good movement accomodation
Interior and exterior use
Lasts up to 25 years

Silicone Sealant | Clear Silicone Sealant with Finishing Tool For a Smooth & Professional Finish | Waterproof & Anti-Mould Protection

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Why We Love It

Seamless blend with any surface.
Long-lasting waterproof protection ensured.
User-friendly tube for easy application.

Main Highlights

Crystal Clear Finish: Our high-quality clear silicone sealant blends seamlessly with any surface, making it perfect for bathrooms, kitchens, and windows.
Strong Waterproof Seal: Provides long-lasting protection against water, mold, and mildew in wet areas such as sinks, bathtubs, and showers.
Easy to Apply: Comes in a user-friendly 120g squeezable tube designed for precise application without mess or waste.
Bonus Finishing Tool Included: Achieve a smooth, professional-looking bead every time with the included sealant finishing tool.
Multi-Purpose Use: Ideal for sealing tiles, ceramic, glass, metal, and other non-porous surfaces – suitable for both DIY users and professionals.

Everbuild – Everflex – 225 Contract Industrial & Glazing Silicone – Industrial and Glazing Sealant – Adheres to Most Common Building Materials – Transparent – 295ml

13% OffFree Shipping

Why We Love It

Permanently flexible and weather-tight.
Powerful anti-mould properties included.
Versatile for various materials.

Main Highlights

BUILDER GRADE – Everbuild Everflex 225 Contract Industrial & Glazing Silicone is permanently flexible for a weather-tight, temperature-resistant seal up to 200˚C.
ANTI-MOULD PROPERTIES – Contains a powerful anti-fungal compound to prevent mould growth and discolouration.
VERSATILE – Seals glass to glass, glass to aluminium, glass to metal, and channel glazing. Use to seal worktops and laminated panels, timber and uPVC windows, and aluminium gutters.
FAST DRYING – Everbuild Everflex 225 Contract Industrial & Glazing Silicone skins over in ten minutes at 20˚C. Fully cures at a rate of 4mm per 24 hours, dependent on humidity and temperature.
EASY TO APPLY – Applies easily with a caulk, sealant or adhesive gun. We recommend the Everbuild Power Pro Heavy Duty Sealant / Adhesive Cartridge Applicator Gun.
MULTIPLE COLOURS: Also available in white, black, and brushed steel.

Everbuild Forever Clear Anti-Mould Silicone Sealant – Permanently Waterproof – Suitable for Internal And External Use – Clear – 295ml

32% OffFree Shipping

Why We Love It

Prevents mould growth effectively.
Available in multiple colours.
Ideal for high humidity areas.

Main Highlights

LONG-LASTING – With a 25% flexibility factor and a waterproof finish, Forever Clear is a superior hygienic silicone sealant for areas of high humidity.
IDEAL FOR AREAS OF HIGH HUMIDITY – From shower bases and cubicles to wet rooms; around baths, sinks, basins, and more – the waterproof cured product works perfectly in frequently damp areas.
VERSATILE – You can also use it in utility rooms, kitchens and all applications where the air is moist and maximum hygiene protection is required.
CONTAINS MOULD SHEILD – An independently tested ingredient that prevents mould growth for up to 10 years, tested under simulated ageing conditions.
ANTI-BACTERIAL PROPERTIES – Actively protects against the growth of bacteria, mildew and black mould that can commonly occur in high-humidity environments.
MULTIPLE COLOURS – Available in white, ivory, clear and grey to best suit your kitchen, bathroom or humid area decor.

8.8

Excellent

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We scanned 1821 products

We reviewed these offers relevant to the External Clear Silicone Sealant Waterproof 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 Unibond, Hemway, Everbuild, Polar Specialist Coatings, Gorilla, EVO-STIK, ADVANCEDSIL, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best External Clear Silicone Sealant Waterproof in the market, we considered we took a deep dive into 9106 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 Unibond Outdoor Extreme Repair - Translucent 294g. We love many things about this product by Unibond. What sets it apart from the competition is Highly durable and resilient, Ideal for all weather, Superior wet surface adhesion.
The best value product for most shoppers and where user satisfaction is continuously the highest is UniBond Anti-Mould White, Waterproof Mould Protection, Long-lasting White Silicone Sealant for Kitchen & Bathroom, Powerful Bath Sealant, 1 x 274g Cartridge by Unibond based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for External Clear Silicone Sealant Waterproof and the best cost-to-value ratio is Gorilla 1144110 All Conditions Sealant Silicone Clear 295mlat Gorilla with a 55% discount.
Our list of the best External Clear Silicone Sealant Waterproof 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 External Clear Silicone Sealant Waterproof in The UK

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We scanned 1821 products

We concluded that: