Best Liquid Membrane Waterproofing of 2025

Last updated on 15/09/2025
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Best Choice
1
9.8
Exceptional
Siramico Coatings Liquid Rubber Roof Coating | 5 Litres | Instant Leak Seal Technology I Quick Drying, One Coat Waterproofing Sealant | Black, Grey & Clear (Black, 5 Liters)
SIRAMICO COATINGS
Siramico Coatings Liquid Rubber Roof Coating | 5 Litres | Instant Leak Seal Technology I Quick Drying, One Coat Waterproofing Sealant | Black, Grey & Clear (Black, 5 Liters)
Why we love it
  • Versatile for various surfaces.
  • No primer or second coat.
  • Long-lasting waterproof protection.
Main Highlights
  • ✅Designed for both flat and pitched roofs, this high-performance coating adheres to a wide range of surfaces, including asphalt, brick, concrete, GRP, metal, felt, OSB, and more.
  • ✅No primer needed, no second coat required—just a single, easy application with a brush or roller. Siramico Coatings Liquid Rubber Coating is perfect for hassle-free DIY use, delivering a professional finish with minimal effort.
  • ✅Forming a seamless, elastic membrane, this liquid rubber coating expands and contracts with your surface, providing strong adhesion and waterproofing that lasts up to 10 years.
  • ✅Quick drying and ease to use straight out of the can liquid rubber solution for all your waterproofing requirements.
9.8
Exceptional
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Best Value
2
9.7
Exceptional
Liquid Rubber Waterproof Sealant - Leak Repair Indoor and Outdoor Coating, Water-Based, Easy to Apply, Black, 3.78 Litres
Liquid Rubber
Liquid Rubber Waterproof Sealant - Leak Repair Indoor and Outdoor Coating, Water-Based, Easy to Apply, Black, 3.78 Litres
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Why we love it
  • Impressive flexibility and UV stability.
  • Applies easily in dry conditions.
  • Environmentally friendly, odor-free solution.
Main Highlights
  • HIGHLY FLEXIBLE & DURABLE - Final membrane has over 1000% elongation preventing adhesion failure, and is UV Stable stopping the sun from degrading the product. Product remains tacky - not suitable for walking surfaces
  • HIGHLY FLEXIBLE & DURABLE - Final membrane has over 1000% elongation preventing adhesion failure, and is UV Stable stopping the sun from degrading the product
  • APPLICATION - Do not apply in wet conditions or within 24 hours of rain. Apply to a dry surface, free loose flaky paint and coatings or anything that would prevent adhesion. Typically cures within 24-48 hours!
  • CONVERSION - 1 US Gallon is equal to 0.83 UK Gallons - 5 US Gallons are equal to 4.16 UK Gallons
  • ENVIRONMENTALLY FRIENDLY - Liquid Rubber Waterproof Sealant/Coating is water based, containing no solvents, VOC's or harmful odors. Safe for humans and pets alike, can be used indoors and outdoors with no special breathing apparatus
  • Packaging may vary
9.7
Exceptional
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3
9.5
Superb
3C Sealants Liquid Jacket Liquid Rubber Membrane – 6kg Grey | Ready-to-Use Waterproofing Sealer | Highly Elastic Polymer for Roofs, Walls, Basements, Bathrooms, Floors & More
Liquid Jacket
3C Sealants Liquid Jacket Liquid Rubber Membrane – 6kg Grey | Ready-to-Use Waterproofing Sealer | Highly Elastic Polymer for Roofs, Walls, Basements, Bathrooms, Floors & More
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Why we love it
  • Immediately waterproof on application.
  • Applicable on damp surfaces.
  • Versatile application methods available.
Main Highlights
  • Can be used on damp surfaces
  • Can be used internally or externally
  • Use in vertical and horizontal applications
  • Immediately waterproof
  • Anti-slip membrane
  • Fast curing to a highly elastic sealing layer
  • Good UV and weather resistance
  • Durable, no brittleness
  • Odourless
  • Can be applied with a brush, roller, squeegee or scraper/spatula
9.5
Superb
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4
9.4
Superb
Everbuild Liquid Roof | All Weather Roofing System Ideal for Concrete, Mortar and Metals - Slate Grey - 21 kg
Everbuild
Everbuild Liquid Roof | All Weather Roofing System Ideal for Concrete, Mortar and Metals - Slate Grey - 21 kg
Why we love it
  • Fast-curing waterproofing liquid membrane.
  • Suitable for various substrates.
  • Ideal for new or existing roofs.
Main Highlights
  • Liquid Roof is a fast-curing, polyurethane based waterproofing liquid membrane for flat and pitched roofs.
  • Liquid Roof has excellent adhesion to both porous and non-porous substrates and is suitable for use on new projects, extensions or to refurbish an existing, leaky roof.
  • Ideal for use on concrete, mortar, brick, stone, fibre cement, roof tiles, metals, wood and tiles. Can also be used on roofing felt, asphalt and bituminous coatings however full reinforcement must be used with these surfaces as they may soften after application. Reinforce using a suitable reinforcing fleece.
  • For waterproofing underneath tiles bonded with adhesives on balconies and terraces.
  • Ensure substrate is in good condition e.g. cracks sealed, sound joints, tiles securely fastened etc. All timbers used in roof constructions must be suitable for exterior use. Adhere to good building practices in the selection of building materials and design of roof constructions.
9.4
Superb
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5
9.4
Superb
Save 7%
Everbuild Aquaseal Waterproof Tanking Membrane – Flexible – Waterproof – Easy To Apply – Internal And External – Blue – 5 Litre
Everbuild
Everbuild Aquaseal Waterproof Tanking Membrane – Flexible – Waterproof – Easy To Apply – Internal And External – Blue – 5 Litre
7% OffFree Shipping
Why we love it
  • Versatile for interior and exterior.
  • Formula ensures quality sealing.
  • Ready, easy to use.
Main Highlights
  • WATERPROOF – Provides a permanent, flexible, and watertight seal prior to tiling on surfaces such as plasterboard, concrete, plywood, and more.
  • FORMULATED WITH INDUSTRY BEST PRACTICES IN MIND – Following tried-and-tested principles from Scandinavia and Germany, this product provides quality and peace of mind.
  • READY TO USE – Creates a watertight barrier on walls and floors covering up to 7.5m² depending on the substrate.
  • SURFACES - Can be applied to plasterboard, MDF, plywood, cementitious board, brickwork, concrete and specialist wet room boards.
  • SUITABLE FOR INTERIOR AND EXTERIOR USE – Ideal for showers, wet rooms and bathrooms, as well as balconies and partially covered exterior areas.
9.4
Superb
Save 7%
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6
9.3
Superb
Save 3%
Mapei MAPEGUM WPS Fast Drying Tanking Membrane 5 Kg -Mapei 124805
Mapei
Mapei MAPEGUM WPS Fast Drying Tanking Membrane 5 Kg -Mapei 124805
3% Off
Why we love it
  • High coverage per weight.
  • Easy-to-apply waterproofing solution.
  • Reliable for construction needs.
Main Highlights
  • Size: 5Kg
  • Mapei 124805 Mapei MAPEGUM WPS
  • COVERAGE: approx. 1.5 kg/m2 per mm of thickness.
9.3
Superb
Save 3%
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7
9.2
Superb
Liquid Rubber Basement and Foundation Repair Sealant - Waterproof Concrete Sealer & Crack Filler - Flexible Coating for Indoor & Outdoor Use - Waterproofing Paint - Black, 3.78 Litres
Liquid Rubber
Liquid Rubber Basement and Foundation Repair Sealant - Waterproof Concrete Sealer & Crack Filler - Flexible Coating for Indoor & Outdoor Use - Waterproofing Paint - Black, 3.78 Litres
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Why we love it
  • Highly flexible with 900% elongation.
  • No mixing required, easy application.
  • Safe for humans and pets.
Main Highlights
  • SUPERIOR FLEXIBLE SEALANT: Liquid Rubber's foundation sealer creates a permanent waterproof membrane for basement waterproofing, foundation leak repair, shower liners, and planter boxes. This professional-grade sealer delivers unmatched protection with 900% elongation, preventing leaks and water damage more effectively than traditional sealants
  • COMPLETE BASEMENT WATERPROOFING SYSTEM: Surpassing basic concrete paint, concrete sealers, and standard waterproof agents, this waterproofing membrane is designed to seal and protect against active leaks and moisture, making it perfect for basement leak and foundation repair. Seamlessly compatible with self leveling concrete applications
  • VERSATILE CONCRETE CRACK FILLER: The professional-grade rubber coating and rubber waterproofing technology maintains flexibility in all temperatures, preventing future cracks and damage. This liquid rubber waterproof sealant provides superior adhesion to concrete, masonry, wood, metal, and foundation surfaces, making it an ideal choice for your DIY projects
  • MAXIMUM COVERAGE & PERFORMANCE: This high-build basement sealer goes on like waterproof paint - Interior basement surfaces: 50 sq ft/gallon (requires: 2-3 coats), Exterior concrete sealer outdoor surfaces: 20 sq ft/gallon (requires: 3-4 coats). Apply between 50°F-90°F. For complete protection, use the rubber sealant with Liquid Rubber Geo-Textile on joints and transitions
  • IMPORTANT USAGE GUIDELINES: The water-based foundation sealer formula contains zero VOCs for safe indoor application. No mixing required! Apply by brush, roller, or professional sprayer as part of your basement waterproofing system. Not suitable for walking surfaces due to tackiness when cured
  • FOR A WATERTIGHT SYSTEM - Use rubber sealant with Liquid Rubber Geo-Textile on joints and transitions, fill small cracks with Liquid Rubber Sealant & Adhesive, and bridge joints, seams, vents, and protrusions where movement may occur. Scroll down for full application steps
9.2
Superb
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8
9.0
Superb
Drybase Liquid Damp Proof Membrane (1 Litre, White) - Damp Proofing Paint for Internal Walls and Floors. Waterproof Paint
Drybase
Drybase Liquid Damp Proof Membrane (1 Litre, White) - Damp Proofing Paint for Internal Walls and Floors. Waterproof Paint
Free Shipping
Why we love it
  • Effective moisture and gas barrier.
  • Quick drying in one hour.
  • Versatile on many substrates.
Main Highlights
  • High-Strength damp-proof barrier highly effective against moisture ingress and ground gases in floors and walls.
  • Low Odour thanks to its water-based and Bitumen-Free formulation, presenting excellent adhesion and drip-resistant properties.
  • Versatile damp proof membrane - Can be used on a large range of substrates such as brick and timber.
  • Quick-Drying & Strong Bond - two-coat application with a fast 1-hour initial drying time: can be used immediately with no special curing required.
  • Extensively tested for high performance and produced in accordance with quality and environmental management systems - 1L Coverage: Approx. 1m²
9.0
Superb
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9
8.9
Excellent
Nassboards Waterproof 5L Tanking Membrane for Wetrooms, Bathrooms, Kitchens and Waterproofing – Perfect for Wet Zones, Tiling Showers, Preventing Moisture – 5 Litre Waterproof Tanking Membrane
Nassboards
Nassboards Waterproof 5L Tanking Membrane for Wetrooms, Bathrooms, Kitchens and Waterproofing – Perfect for Wet Zones, Tiling Showers, Preventing Moisture – 5 Litre Waterproof Tanking Membrane
Why we love it
  • Premium waterproofing for wetrooms.
  • Works on many surfaces.
  • Quick drying within 24 hours.
Main Highlights
  • PREMIUM WETROOM WATERPROOFING: Introducing the WSK Wet Room Waterproof Tanking Membrane, brought to you by Nassboards, the experts in Kitchen, Bathroom & Wetroom Waterproofing. This Waterproof Tanking Membrane provides you with the tool you need to waterproof both walls and floors prior to tiling showers, wet rooms, wet zones and other areas susceptible to water and excessive moisture. It forms a permanently flexible, watertight membrane that goes behind the tile so that water doesn’t
  • APPLICABLE ON SO MANY SURFACES: This non-hazardous, solvent free membrane is great to use on the majority of common surfaces, such as Plasterboard, MDF, Plywood, Cement Boards, Blockwork, Concrete and Specialist Wet Room Boards. The membrane works effortlessly with most materials, and gives you peace of mind regardless of the composition of your bathroom or wetroom’s substrate
  • JUST THE TUB: If you don’t need the kit, then just take the tub! Our Nassboards Tanking Membrane Container holds 5L, which is the same tub you’d receive if you were to purchase the Large size kit, which provides you with enough coatings you’ll need to waterproof an area measuring 8m². We’ve got everything you need to renovate your bathroom, kitchen or wetroom in a safe and stress-free way
  • QUICK DRYING: When you purchase from Nassboards, you will receive a high quality Membrane that is easily applicable by brush. The material is non-hazardous and is solvent free, and dries quickly within 24 hours, so you can start tiling as soon as possible. This premium, professional membrane is a must have tool if you want to do it right
  • NASSBOARDS CARE: We at Nassboards are as passionate as we are confident about the quality of our Wetroom Waterproofing Kit. We take a lot of care to ensure that we leave you a satisfied customer every step of the way. If at any point you are not happy with our product, contact us so that we can make it right
8.9
Excellent
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10
8.8
Excellent
Liquid Waterproof Sealant, Hupeyna Invisible Waterproof Agent, Transparent Repairing Leak Waterproof Adhesive, Indoor and Outdoor Water-Based Waterproof Coating 35 Ounces
Hupeyna
Liquid Waterproof Sealant, Hupeyna Invisible Waterproof Agent, Transparent Repairing Leak Waterproof Adhesive, Indoor and Outdoor Water-Based Waterproof Coating 35 Ounces
Free Shipping
Why we love it
  • High quality, lasting waterproofing.
  • Easy, adaptable application.
  • Repairs and protects surfaces.
Main Highlights
  • Practical & High Quality: Liquid waterproofing sealants/coatings are water-based. Multiple overlapping coats form a permanent bond. Invisible waterproof glue forms a film that insulates against air, water and moisture. The roof sealant waterproof is waterproof, long-lasting waterproof, low temperature and heat resistant. The use of transparent repairing leak waterproof adhesive can form a long-term protective film, which helps to save time, money and energy.
  • Transparent Waterproof Glue is Easy to Use: Mix the invisible waterproof glue well before use. Brush, roll, wipe, dip or pour, you can use the brush to dip and wipe, roller to apply, pour and then apply. The liquid waterproof sealant is applied evenly, and the self-leveling formula can smoothly cover and penetrate small gaps and cracks, and play a sealing role. Water-based waterproof sealant is suitable for both indoor and outdoor use.
  • Liquid Waterproof Sealant Coverage: Each 1 kg of product covers approximately 14 sq ft (1.3 sq m). Apply in 3-4 thick layers. Waterproof coating adheres easily to surfaces, repairing holes, cracks, crevices, tears and leaks, and sealing any cracked surfaces. Roof sealant waterproof also forms a protective waterproofing layer in the immediate area.
  • Liquid Waterproof Sealant Protect Surfaces and Repair Leaks Use on - Flat roofs, sloped roofs, roofs, external wall cracks, foundations, sheds, basements, metal, wood, concrete, gutters, skylights, chimneys*, PVC pipe joints, windows, RVs, DIY projects, external walls pipeline, seals pipeline leaks, walls, corners, toilet leaks, substrate joints, car roofs, pools, baths and more.
  • Invisible Waterproof Agent Cold and Wet Tip: Prolonged rainy and wet weather, falling temperatures can cause waterproof adhesive to take longer to cure. We recommend that you try to ensure that the weather is sunny and the operating environment is relatively dry before and after applying the waterproof glue. Liquid rubber sealant use temperature: 10˚C/50˚F or higher (including overnight temperatures).
8.8
Excellent
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