10 Best Flexible Sealant in The UK

Last updated on 04/07/2025

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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

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.

EVO-STIK Strong Stuff Sealant & Adhesive, Flexible and Waterproof Sealant, High-Strength Adhesive, Solvent Free, Colour: White

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Why We Love It

Super strength for all tasks.
Waterproof and moisture curing.
For interior and exterior use.

Main Highlights

A high strength grab adhesive and waterproof sealant
Sticks most materials including wood, tiles, ceramics, plastics, metal and more
Cures to a tough, flexible sealant which can be overpainted
Solvent free, suitable for interior and exterior use
Contents: 1x EVO-STIK Strong Stuff Sealant & Adhesive, Colour: White
Super Strength
Moisture Curing Adhesive
Interior & Exterior Use
2-in-1 Sealant & Adhesive
Waterproof

AMK® Polycell Polyfilla Decorators Caulk White 380ml Trade Cartridge Flexible Acrylic Sealant for Skirting Boards Window Frames Door Frames Paintable

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Why We Love It

Fast drying feature saves time.
Paintable after 1 hour.
No sanding required, effortless.

Main Highlights

FLEXIBLE ACRYLIC FORMULA: Provides a permanently flexible seal that accommodates movement, preventing cracks and gaps from reappearing. Ideal for areas prone to expansion and contraction, like skirting and frames.
SMOOTH WHITE FINISH: Dries to a smooth, white finish that can be easily painted over to match your décor. This ensures a professional and seamless look, without any additional and unnecessary work after apllication.
LARGE 380ML TRADE CARTRIDGE: The 380ml cartridge provides ample caulk for multiple projects, making it a cost-effective choice for both DIYers and professionals. Requires a standard caulking gun for application.
IDEAL FOR SKIRTING BOARDS AND FRAMES: Specifically designed for sealing gaps and cracks around skirting boards, window frames, door frames, and other interior trim. Provides great and long lasting finish.
EASY APPLICATION WITH CAULK GUN: Designed for use with a standard caulking gun (not included), allowing for precise and controlled application. This ensures a clean, even bead of caulk with minimal effort.
PREVENTS DRAFTS AND MOISTURE: Creates an airtight and watertight seal that helps prevent drafts, moisture ingress, and heat loss. This improves energy efficiency and protects your home from damage.
PAINTABLE AND EASY TO CLEAN: Can be painted over with most common types of paint once dry. The smooth surface is also easy to clean with a damp cloth, maintaining a neat and tidy appearance.
INTERIOR USE DESIGNED PRODUCT: Formulated for interior use, providing a durable and long-lasting seal in a variety of applications. Perfect solution to use inside the house, to seal all gaps and cracks.
QUICK DRYING FORMULA CAULK: Dries relatively quickly, allowing you to paint over it in a short amount of time (check product packaging for specific drying times). Very convenient, and easy to use for everybody.
TRUSTED BRAND FOR CAULK: From Polycell, a leading brand in fillers, sealants, and DIY repair products. This decorators caulk is backed by a reputation for quality and performance for many years.

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

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Why We Love It

Mould resistant and waterproof sealant.
Advanced polymer and underwater curable.
Environmentally friendly 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.

Everbuild Everflex 195 Premium+ Siliconised Acrylic Sealant – Mould Resistant – Permanently Flexible – Overpaintable – White – 300ml

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Why We Love It

Flexible for various surfaces.
Quick-drying for convenience.
Easy to apply and clean.

Main Highlights

SUITABLE FOR INTERNAL AND EXTERNAL APPLICATIONS – Ideally suited for sealing around door and window frames, repairing cracks in brickwork, stone, plaster and concrete, and filling gaps before decorating.
PERMANENTLY FLEXIBLE – Tack-free in under an hour and fully cured in less than five days to give a long-lasting seal, depending on thickness, temperature and humidity.
VERSATILE FORMULA – Use it to adhere virtually all substrates including timber, metal, brickwork, stone, concrete, plaster and PVCu.
SUPERIOR ADHESIVE PROPERTIES – Suitable as an adhesive on lightweight materials such as polystyrene or cork coving and tiles.
EASY TO APPLY – Use a standard cartridge applicator gun for smooth and even application. Mistakes are easily removed before drying with a sponge and warm water.
195 Siliconized Acrylic White
Size: 310ml
Brand: Everbuild

Everbuild External Frame Sealant – Interior And Exterior Use – Permanently Flexible – Mould-Resistant – Grey – 290ml

Why We Love It

Long-lasting and mold-resistant formula.
Seamless finish when overpainted.
Easy application with standard gun.

Main Highlights

DESIGNED FOR INTERIOR AND EXTERIOR USE – Use to complete internal and external sealing around timber and metal window and door frames, plus the internal sealing of PVCu windows and doors.
LONG-LASTING – A no-slump formula that remains permanently flexible and has mould-resistant components for a long-lasting seal.
ALSO SUITABLE FOR SEALING CRACKS AND GAPS – An acrylic-based sealant that you can use for sealing cracks and gaps in brickwork, stone and concrete.
OVERPAINTABLE – Apply this ready-to-use thixotropic paste to most surfaces and paint over it for a seamless finish, overpainting is recommended externally to prolong the working life of the product.
EASY TO APPLY – Simply insert the cartridge into a sealant application gun, such as the Everbuild Power Pro Heavy Duty Sealant Gun, snip the tip and go.
MULTIPLE COLOURS – Available in grey, white, brown and stone to enable the best colour match for the area of application.

Everbuild Timber and Laminate Sealant – Permanently Flexible – Sealant and Gap Filler – Solvent Free – Pine – 290ml

Why We Love It

Flexible and durable sealant.
Mould protection included in formulation.
Available in multiple colours.

Main Highlights

WORKABLE – This product is a permanently flexible polymer-rich sealant and gap filler.
VERSATILE – Designed for sealing around laminate flooring, fitted furniture and kitchen worktops.
ANTI-MOULD FORMULATION – Contains a fungicide to protect against mould growth in the sealant.
LOW MAINTENANCE – Leaves a matt finish which will not pick up dirt and is easy to clean. Can be painted, varnished or stained once cured.
MULTIPLE COLOURS – The versatile four-colour range offers a near or exact match to many popular laminate floors and melamine board finishes. It's available in Beech, Mahogany, Oak and Pine.

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

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

SX White Premium Paintable Caulk Acrylic - Premium Quality Acrylic for Sealing Gaps & Cracks - Long Lasting Flexible Seal - Interior and Exterior Use - Overpaintable - 380ml

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Why We Love It

No primer needed for adhesion.
Easy application and cleanup.
Almost odourless, use in confined areas.

Main Highlights

OVER PAINTABLE- Acrylic Caulk can be overpaintable to match existing paint work, with water based and synthetic paints.
NO PRIMER REQUIRED - You will achieve perfect adhesion on most surfaces without the need for primer.
LOW ODOUR - With our formular, our caulk is almost odourless so can be used in confined spaces.
EASY TO APPLY - Simply gun onto the surface and smooth off, clean up with soap and water.
CONTENTS - 1 x SX White Premium Paintable Caulk Acrylic 380ml

9.2

Superb

We scanned 298 products

We reviewed these offers relevant to the Flexible 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 Unibond, ADVANCEDSIL, EVO-STIK, AMK, Hemway, Everbuild, Hasbro, Siroflex, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Flexible Sealant in the market, we considered we took a deep dive into 1491 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 Anti-Mould White, Waterproof Mould Protection, Long-lasting White Silicone Sealant for Kitchen & Bathroom, Powerful Bath Sealant, 1 x 274g Cartridge. We love many things about this product by Unibond. What sets it apart from the competition is Mould resistant, strong and flexible, Ideal for humid environments, Easy and quick application.
The best value product for most shoppers and where user satisfaction is continuously the highest is Silicone Sealant | Clear Silicone Sealant with Finishing Tool For a Smooth & Professional Finish | Waterproof & Anti-Mould Protection by ADVANCEDSIL based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Flexible Sealant and the best cost-to-value ratio is Everbuild Everflex 195 Premium+ Siliconised Acrylic Sealant – Mould Resistant – Permanently Flexible – Overpaintable – White – 300mlat Everbuild with a 7% discount.
Our list of the best Flexible 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 Flexible Sealant in The UK

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We scanned 298 products

We concluded that: