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Damp concrete, residual moisture, rising damp — these are the project killers that threaten floor and wall finishes. RLA Moisture Seal confronts these challenges directly. It provides a high-performance, hydrostatic-pressure-resistant barrier and primer system, specifically engineered for demanding moisture management applications. Get the right start, even on the toughest substrates.
RLA Moisture Seal is a high-performance, 2-part water-based epoxy primer and barrier coating system. It handles up to 25 metres (250Kpa) of hydrostatic pressure, specifically designed to prevent moisture and vapour ingress. This is a critical distinction from standard primers or flexible membranes: it builds a robust barrier capable of resisting significant water pressure, not just a surface bond or a flexible layer. It protects overlaid coatings and finishes — such as paints, vinyl, carpet, tiles, timber flooring, and levelling compounds — from blistering, delamination, and efflorescence caused by unmanaged moisture. Beyond surface protection, it forms a negative-side moisture barrier for underground structures, like basements and lift pits, and is suitable for potable water storage.
RLA Moisture Seal mixes easily; combine equal parts A and B by volume in a clean pail. Use an electric stirrer for a minimum of 3 minutes to achieve a homogenous consistency, then allow a 5-minute settlement period before application. This ensures full chemical activation and optimal performance. For floors, use a squeegee, stiff nylon broom, or medium/long nap roller. On vertical walls, a medium-long nap roller is recommended. Work the product well into the substrate to ensure optimum absorption and penetration. Regular use of a wet film thickness gauge during application ensures the specified film thickness is achieved for the desired barrier performance. All equipment cleans up immediately with soapy water. Dried product requires mechanical removal.
For overlaying finishes such as levelling compounds, tiling, or screeds, the second coat of Moisture Seal requires sand seeding. Broadcast fine, dry sand into the wet second coat at 750g/m² to achieve at least 90% coverage. Once dry, sweep or vacuum away excess sand to create a mechanical key for adhesion.
RLA Moisture Seal consistently appears as the crucial first step in systems, particularly for Wet Wall and Floor to Non-Habitable Areas. Here, it functions as the primary primer and vapour barrier coating. Its ability to be applied to damp or 'green' concrete allows for a faster start to subsequent layers. For example, it frequently precedes self-levelling compounds such as Trulevel Fine Finish, forming the foundation for a smooth, moisture-protected surface before final floor coverings are installed. This early-stage application ensures the entire system's integrity by managing moisture from the ground up.
Yes, RLA Moisture Seal is designed for application on damp and "green" concrete. Concrete must be cured for at least 28 days, and cement screeds for 7 days, before application.
Yes, this product complies with AS 4020 for potable water storage applications. Ensure adequate ventilation is provided in enclosed areas during the curing cycle.
No, RLA Moisture Seal is not designed as a trafficable surface or for permanent UV exposure. It must be covered with floor toppings, coatings, or conventional coverings for protection and performance.
RLA Moisture Seal withstands up to 2.5 bar, equivalent to 25 metres of hydrostatic pressure. This makes it suitable for underground wall structures like basements and retaining walls.
| Application | Key benefit | Primary trades |
|---|---|---|
| Primer for RLA membrane systems | Enhanced adhesion and a uniform base for overlaid RLA waterproofing and flooring systems. | Waterproofers, Tilers |
| Barrier over damp or "green" concrete | Protects overlaid coatings and finishes from moisture-related blistering or delamination, avoiding costly rework. | Flooring Contractors, Builders, Waterproofers |
| Moisture barrier for decorative finishes | Prevents damage from residual moisture, vapour, rising damp, and efflorescence on floor and wall surfaces. | Flooring Installers, Painters, Tilers |
| Negative side moisture barrier for underground structures | Stops moisture ingress and seepage in basements, lift pits, and retaining walls, maintaining structural integrity. Resists 2.5 bar hydrostatic pressure. | Civil Contractors, Waterproofers, Builders |
| Potable water storage coating | Provides a safe, waterproof lining for tanks and reservoirs, compliant with AS 4020 for drinking water. | Plumbers, Tank Fabricators, Builders |
| High strength repair mortar component | Creates durable, waterproof repair mortars for patching surface defects, cracks, and forming fillets. | Concrete Repairers, Waterproofers |
Combine equal parts (1:1 by volume) of Part A and Part B. Mix for at least 3 minutes at low-medium speed until fully homogenous. Allow 5 minutes to settle before use.
Apply with squeegee, stiff broom, or medium/long nap roller, ensuring complete substrate coverage and filling of pinholes.
Danger: Both Part A and Part B are hazardous chemicals. Part A is also classified as dangerous goods. May cause skin irritation, serious eye irritation, allergic skin reaction, and in the case of Part B, allergy or asthma symptoms if inhaled. Part A is toxic to aquatic life with long-lasting effects.
Wear safety glasses with side shields or chemical goggles. Use chemically protective gloves such as Ethyl Vinyl Alcohol (EVAL laminate), Butyl Rubber, Nitrile Butyl Rubber, or Neoprene. Avoid cotton, leather, or natural rubber gloves. Wear overalls and a P.V.C. apron. If ventilation is inadequate, or when handling Part B, use a Type A-P or AK-P filter respirator.
Use in a well-ventilated area. In enclosed spaces like water tanks, ensure adequate ventilation during the curing cycle to allow proper evaporation of the coating.
Store in original, securely sealed containers in a cool, dry, well-ventilated area, away from direct sunlight and cold floors. Keep away from ignition sources. Part A may form unstable peroxides and polymerise with heat or in contact with oxidisers, strong acids, bases, and amines. Avoid cross-contamination between Part A and Part B. Dispose of containers by returning to supplier for recycling, or puncture and bury at an authorised landfill. Do not allow wash water to enter drains; collect for treatment if necessary.
Proper surface preparation is crucial for adhesion and long-term performance, preventing callbacks and failures.
Surface prep: Ensure surfaces are sound, clean, and free from loose material, dirt, oils, and curing compounds. Mechanically remove structurally unsound layers. Concrete must be cured for at least 28 days.
Primer: Required. RLA Moisture Seal acts as the barrier and primer.
Surface prep: Surfaces must be sound, smooth, and free of contaminants. Fill all voids, holes, and heavy undulations. Cement render/sand cement screeds need to cure for at least 7 days.
Primer: Required. RLA Moisture Seal acts as the barrier and primer.
Surface prep: Point masonry surfaces flush. Fill all surface defects including cracks and pitted sections to create a sound and level base. Ensure it is free from moss and algae.
Primer: Required. RLA Moisture Seal acts as the barrier and primer.
Surface prep: Surfaces must be clean, sound, and dry. Remove any loose material, dust, grease, or wax residues. Ensure the substrate is fit for purpose and installed to manufacturer's recommendations.
Primer: Required. RLA Moisture Seal acts as the barrier and primer.
| Property | Value |
|---|---|
| Colour | Part A: White, Part B: Light Grey |
| Form | Viscous liquid |
| Mix Ratio | 1:1 by volume |
| Specific Gravity (mixed) | 1.25 |
| Hydrostatic Water Pressure Resistance | 2.5 bar |
| Water Vapour Transmission (2 coats @ 200µm DFT) | 1.8 g/m²/24 hours (ASTM E96 Desiccant) |
| Pot Life | 2 hours |
| Recoat Time | 4 hours |
| Time to Apply Finishes | 24 hours |
| Time to Immersion | 10 days |
| General Primer Coverage | 1 litre/10m² (50 micron dry film thickness) |
| Vapour Barrier Coverage | 1 litre/5m² (100 micron dry film thickness) |
| Moisture Barrier Coverage | 2 x 1 litre/5m² coats (200 micron total dry film thickness) |
Here are some common examples on where RLA Moisture Seal used by our customers.
