Poseidon - Bathroom & Wetroom Waterproofing Membrane Paint (7kg, 10kg, 12kg) - Spray / Roller
Poseidon - Bathroom & Wetroom Waterproofing Membrane Paint (7kg, 10kg, 12kg) - Spray / Roller
Product Overview
Poseidon Bathroom & Wetroom Waterproofing Membrane Paint is a liquid-applied, polymer-based membrane available in 7kg, 10kg, and 12kg containers. Designed for use with spray, roller, or brush application, it provides a seamless, durable waterproofing layer suitable for high-moisture environments. This waterproofing membrane is formulated to create a long-lasting vapor barrier that protects wet areas from water ingress and vapour penetration. Its flexible composition allows it to accommodate building movement without cracking, ensuring ongoing waterproof performance in bathrooms, steam rooms, and wetrooms prior to tiling installations.
Materials and Composition
The Poseidon waterproofing membrane is a polymer-based, liquid-applied membrane that cures into a flexible, seamless film. It is engineered for durability and resistance to water vapour transmission, with adhesion tailored to various substrates such as concrete, cementitious substrates, and tiles. The membrane forms a robust barrier that is resistant to UV exposure, chemicals, and environmental wear, suitable for continuous contact with moisture and steam.
Dimensions and Capacity
The product is available in 7kg, 10kg, and 12kg volumes, providing coverage dependent on application thickness. Typically, a 10kg container covers approximately 15-20 square meters at a 1mm thickness. The membrane supports consistent, even coverage when applied via spray, roller, or brush, with a recommended minimum thickness of 1mm for effective waterproofing.
Key Features
- High Vapour Barrier Performance – Provides a complete vapor block to prevent moisture transmission in wet areas.
- Seamless and Flexible – Cures into a continuous membrane that accommodates building movement without cracking.
- Easy Application Options – Suitable for spray, roller, or brush application, enabling quick installation.
- Durable Long-Term Waterproofing – Offers reliable protection against water ingress and vapour penetration for years of use.
- Adhesive Compatibility – Bonds effectively to concrete, cement-based substrates, and tiles, ensuring a secure and waterproof installation.
- No Corner Reinforcements Needed – The membrane's flexibility eliminates the requirement for additional corner or joint reinforcements, simplifying prep work.
Ideal Use Cases and User Recommendations
The Poseidon waterproofing membrane is ideal for professionals and DIYers working on bathrooms, steam rooms, wetrooms, and other high-moisture environments where maximum vapour and water protection are required. It is suitable for both new installations and refurbishments, particularly in situations where moisture control and long-term waterproofing are priorities. The membrane’s easy application process makes it suitable for rapid projects, minimizing downtime and labor effort.
Included Items and Additional Details
Each order includes the selected volume of Poseidon waterproofing membrane paint in a ready-to-use container. No additional tools are included, but rollers, brushes, or spraying equipment are recommended based on application preference. The product is not designed for coverage of structural elements outside wet areas; it should be used as part of a complete waterproofing system.
Care, Maintenance, and Storage
After curing, the membrane requires no special maintenance. It can be cleaned with water and mild detergents if necessary. The product should be stored in a cool, dry place, away from direct sunlight, and kept tightly sealed to prevent contamination. For optimal longevity, avoid exposure to extreme temperatures and UV light. The membrane offers long-term waterproofing with proper application and handling.
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- Technical Data
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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 substratesSurfaces with continuous water contact or standing water pressureMoving cracks or highly flexible jointsNon-compatible coatings or unsuitable finishes
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.
Product Collection:Poseidon
Applied By:Airless Spray machine, roller or paintbrush
Colour: Blue
Size:7kg
Ideal for:
- Bathrooms
- Wetrooms
- Showers
- Kitchens
- Any area with regular water exposure
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
At Intelligent Membranes, we help architects, contractors, retrofitters and self-builders achieve airtightness and waterproofing targets with liquid-applied systems. Our flagship airtight system, Passive Purple®, is airtight at all times yet breathable when the building fabric needs to release vapour — we call this intelligent breathability.
Why Choose Poseidon?
Poseidon is a high-performance, polymer-based waterproofing coating that cures to a flexible, seamless membrane with exceptional crack-bridging properties. Designed for use in showers, bathrooms, steam rooms, and wet areas, it provides reliable waterproof protection before tiling. Once applied, Poseidon forms a durable barrier that accommodates movement within the substrate, ensuring long-term protection in areas exposed to constant moisture and thermal stress.
Shipping & returns summary
Shipping & returns summary
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 the following for advice on returning goods to us.

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