Description Product Overview ARDEX WPM 300 is a two-component, water-based epoxy barrier coating designed for use as a moisture barrier, primer, and waterproofing system across a wide range of substrates. It is suitable for application over damp and green concrete, providing a reliable solution where moisture conditions would typically prevent flooring installation. The system delivers low water vapour transmission and is capable of withstanding hydrostatic pressure, making it suitable for below-grade and negative side waterproofing applications such as basements, lift wells, and retaining walls. It is also compliant with potable water standards, allowing use in tanks and containment structures. ARDEX WPM 300 is commonly used prior to levelling compounds, adhesives, and waterproofing membranes where moisture control is critical. Key Features Two-component water-based epoxy moisture barrier Compatible with damp surfaces and green concrete Withstands hydrostatic pressure up to 250kPa Prevents rising damp and efflorescence Low water vapour transmission performance Potable water compliant (AS4020) Suitable as primer, barrier coating, or waterproofing layer Excellent adhesion to a wide range of substrates Applications Moisture barrier over damp or green concrete Waterproofing in basements, tunnels, and retaining walls Negative side waterproofing applications Primer prior to ARDEX membranes, adhesives, and levellers Barrier coating to prevent efflorescence Waterproofing for potable water containment structures Notes Mix Part A and Part B thoroughly at 1:1 ratio before use Apply by roller, brush, or spray depending on application Single coat for primer or green slab sealing applications Two coats required for moisture barrier or waterproofing Typical recoat time approx. 4 hours Allow minimum 24 hours cure before overcoating Ensure substrate is clean, sound, and free of contaminants Technical Information Technical Specifications: Type Two-component water-based epoxy barrier coating Mix Ratio 1:1 (Part A : Part B) Coverage (1 coat) Approx. 3.0 m²/L Coverage (2 coats) Approx. 1.5 m²/L total Coverage per 20L kit Approx. 60 m² (1 coat) / 30 m² (2 coats) Recoat Time Approx. 4 hours Full Cure Approx. 7 days Pot Life Approx. 2 hours (23°C) Hydrostatic Pressure Resistance Up to 250 kPa (≈25m water head) Wet Film Thickness Approx. 300 microns per coat Substrates Concrete, masonry, brick, stone, timber Location Internal and external VOC Approx. 26 g/L Packaging 4L kit and 20L kit Colour Grey, Mojo Black This system is designed for situations where moisture control, hydrostatic pressure resistance, and substrate compatibility are critical. Its versatility allows it to function as both a primer and waterproofing barrier, making it a key component in professional flooring and waterproofing installations.
