EAD 030352-00-0503
Colour(s)Blue
Poseidon is a liquid applied wet room bathroom waterproofing
Paint on waterproof paint
Liquid applied bathroom waterproofing membrane used behind tiles and in wet areas to prevent water damage
Roll applied waterproof paint
bathroom water proof paint before tiling
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SKU: IM/00POS7
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Poseidon Waterproof Membrane Paint (7KG) – Spray / Roller

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EAD 030352-00-0503

Product Collection: Poseidon
Applied By: Airless Spray machine, roller or paintbrush
Colour: Blue
Size: 7kg
Sample Available Here

Our waterproof paint for bathrooms and wetrooms is a high-performance solution specifically designed to protect areas exposed to constant moisture, such as behind tiles and other wet zones. This innovative membrane forms a durable, watertight barrier that prevents water ingress, ensuring long-lasting protection for the structural integrity of your wet areas.

Key Features and Benefits:

  • Ultimate Waterproofing: This paint creates an impenetrable layer, preventing water from seeping into walls, floors, or substructures in bathrooms, wetrooms, showers, and other high-moisture areas.
  • Easy Application: Applied directly behind tiles and wet areas, this waterproof paint is quick to use, making it perfect for both new constructions and retrofit projects. It adheres to a wide range of surfaces, including plasterboard, concrete, and timber.
  • Mold and Mildew Resistant: Designed to resist mold and mildew growth, it ensures a healthier, more hygienic environment by preventing moisture buildup that typically leads to these issues.
  • Seamless Protection: Unlike traditional waterproofing methods that involve membranes and multiple layers, our paint offers a seamless, uniform application without any joints or seams where water can penetrate.
  • Long-Lasting Durability: Built to last, this waterproof paint withstands the rigors of daily exposure to water and humidity, providing reliable protection for the life of the building.

Ideal for:

  • Bathrooms
  • Wetrooms
  • Showers
  • Kitchens
  • Any area with regular water exposure

With our waterproof paint, you can ensure that your wet zones remain protected, keeping moisture where it belongs and maintaining the beauty and integrity of your tiled surfaces.

Product Adheres to 

  • Concrete and concrete blocks
  • Bricks
  • Cement based plaster
  • Plaster (With Supergrip primer)
  • Water-resistant plasterboards
  • Existing tile floors and walls
  • OSB
  • Plywood
  • Chipboard
  • Gypsum Moisture Board (With a primer)
  • Hardie Board (With a primer)
  • Bluclad
  • Other substrates suitable for wetrooms

Poseidon liquid applied waterproof membrane is a polymer based coating which, after application, dries to a flexible membrane. It has high crack bridging properties, for the waterproofing of concrete and cement based surfaces in showers, bathrooms, steam areas, wet rooms that need waterproofing prior to tiling.

Apply with an airless paint spray machine, roller or paintbrush. No corner reinforcements are needed.

 

Any boards with an added water or moisture resistance will need a primer.

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What is Poseidon?

How to Install This Product

Bathroom waterproofing- liquid applied waterproofing
Roll applied waterproof paint
Brush applied bathroom paint
  • Key Details

    Key Details – Poseidon Vapour Block

    • Application Methods: Spray, roller, or brush for quick and even coverage.

    • Drying Phase: Allow to dry undisturbed – keep free from water or liquid contact until fully cured.

    • Easy Cleanup: Simply wash tools and equipment with cold water after use.

    • Durable Protection: Once cured, Poseidon forms a robust, flexible membrane that should be protected until tiling or finishing layers are applied.

    • Ventilation: Ensure good airflow during application, especially in areas with high humidity, for the best results.

    • Smart Compatibility: Designed for a wide range of surfaces, though not suitable for:

      • Bitumen or asphalt-based substrates

      • Surfaces with continuous water contact or standing water pressure

      • Moving cracks or highly flexible joints

      • Non-compatible coatings or unsuitable finishes

    ⚡ Poseidon keeps moisture out, guarantees long-lasting vapour protection, and ensures your wet rooms, bathrooms, and steam areas are safeguarded for the future.

  • Description

    Poseidon – Liquid Applied Vapour Block Membrane

    Even a storm conjured up by Poseidon himself couldn’t break through this expert damp proofer. Poseidon is the ultimate vapour block, designed to protect wet areas and high-moisture environments with unrivalled reliability.

    ✅ Ideal For: Bathrooms, steam rooms, and wet rooms prior to tiling
    ✅ Application: Spray, roller, or brush – quick and easy to apply
    ✅ Unique Advantage: A complete vapour block with no need for corner reinforcements

    Why Choose Poseidon?

    • Total Vapour Block – Stops moisture in its tracks, ensuring your tiling and finishes stay protected.

    • Flexible Membrane – Dries to form a durable, seamless, and flexible barrier that adapts to building movement.

    • Quick & Easy – Apply by spray, roller, or brush for fast coverage and efficient installation.

    • Professional Protection – Perfect for bathrooms, wet rooms, and steam areas, where water and vapour control is critical.

    Techy Corner

    Poseidon is a polymer-based, liquid-applied membrane that cures into a robust flexible film. Once applied, it delivers long-term waterproofing and vapour control, making it an essential choice for professionals working on high-moisture environments.

    ⚡ Poseidon: Because even the gods can’t get past it.

  • Uses

    Suitable Applications – Poseidon Liquid Waterproofing Membrane

    Poseidon is specially developed for bathrooms, wetrooms, and steam areas, providing a complete vapour block that guarantees long-term protection before tiling.

    Ideal substrates include:

    • Concrete & Concrete Blocks – Creates a watertight seal over porous bases.

    • Brickwork – Stops water ingress and prepares walls for a lasting tile finish.

    • Cement-Based Plaster & Water-Resistant Plasterboards – Strengthens weak points and ensures reliable waterproofing.

    • Existing Tile Floors & Walls – Bonds over existing tiles to refresh and reinforce waterproofing layers.

    • Wetroom-Specific Substrates – Compatible with modern wetroom construction systems, ensuring full compliance and durability.

    💧 Poseidon is the ultimate choice for waterproofing bathrooms and wetrooms — delivering a seamless, flexible membrane that keeps moisture exactly where it belongs.

  • Data Sheets & Certificates
    Technical Data Sheet
    Safety Data Sheet
    Install Guide
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  • Delivery

    All delivery charges are included in the price of the products and are dependent on the products selected for purchase. This charge is based on delivery to mainland UK, excluding the Scottish Highlands & the Islands where additional shipping charges will apply. For more information read our delivery policy in full.

    Intelligent Membranes do not offer a next day delivery service.

    Intelligent Membranes aim for deliveries to be with the customer within 2 working days. During the festive period deliveries could take longer.

    Orders placed before 12pm will be dispatched the same day, any orders placed after 12pm will be dispatched the following working day

  • Returns

    We, at Intelligent Membranes, would like you to be 100% satisfied with your purchase and our service. In the unfortunate event of any item being unsuitable or wrong, please read our returns policy in full.

Frequently Asked Questions – Poseidon Liquid Waterproofing Membrane

1. What is Poseidon and how does it work?
Poseidon is a polymer-based, liquid-applied waterproofing membrane designed for bathrooms, wetrooms, and steam areas. Applied by spray, roller, or brush, it dries into a seamless, flexible vapour block that prevents leaks, mould, and water damage before tiling.

2. Why choose Poseidon over traditional tanking systems or sheet membranes?
Unlike rigid tanking boards or sheet membranes that can split, crease, or leave gaps, Poseidon forms one continuous, joint-free barrier. This makes it faster, easier, and more reliable than tapes, boards, and sheet-based waterproofing systems.

3. Is Poseidon suitable for Passivhaus or Net Zero projects?
Absolutely. Poseidon’s airtight, vapour-blocking technology makes it ideal for energy-efficient and low-carbon buildings. By preventing moisture build-up behind finishes, it protects insulation and airtight layers — essential for Passivhaus, Net Zero, and retrofit projects.

4. Where can Poseidon be used?
Poseidon is perfect for:

  • Bathrooms and wetrooms (walls, floors, shower areas)

  • Steam rooms and spa facilities

  • Behind tiles in showers, baths, and splash zones

  • Retrofit projects, applied onto substrates such as concrete, plasterboard, cement screeds, and existing tiles

5. Do I need a primer before applying Poseidon?
Yes — in certain cases. For moisture-resistant plasterboards, dusty surfaces, or substrates with reduced adhesion, we recommend first applying Supergrip Primer to ensure maximum bonding strength. On clean, sound surfaces such as concrete or brick, Poseidon can usually be applied directly.

6. How long does Poseidon last once applied?
Once cured, Poseidon creates a permanent, flexible waterproofing membrane that lasts for the life of the tiled system. It won’t crack, peel, or deteriorate like older methods.

7. Can Poseidon be applied over existing tiles?
Yes. Poseidon can be applied directly to Supergrip applied over existing wall and floor tiles, making it ideal for retrofits and refurbishments where stripping back isn’t practical.

8. How quickly can I tile over Poseidon?
After Poseidon has fully cured (typically within 24 hours depending on humidity and temperature), you can tile directly over it — keeping your project on schedule.

9. What tools do I need to apply Poseidon?
Poseidon can be applied with a paint brush, roller, or spray machine. Surfaces must be primed where necessary and prepared properly for reliable adhesion.

10. Why is Poseidon the best waterproofing for bathrooms and wetrooms?
Poseidon is trusted because it combines:

  • Seamless liquid membrane — no weak spots

  • Proven primer system (Supergrip) for maximum adhesion

  • Rapid application and cure times

  • VOC-free, eco-conscious formulation

  • Reliability for new builds, retrofits, Passivhaus and Net Zero construction

With Poseidon, you’re not just waterproofing your bathroom — you’re guaranteeing long-term protection, airtightness support, and energy efficiency.

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