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When preparing concrete slabs or substrates for critical finishes like waterproofing membranes, flooring, or coatings, moisture and bond are the two biggest variables. Everflex VBS brings certainty to both. This two-part, water-based epoxy primes damp and common building materials while also acting as a robust negative hydrostatic vapour barrier. It’s the reliable first step, ensuring your topcoats adhere correctly and moisture stays where it belongs.
Everflex VBS was engineered to solve a dual problem on construction sites: the need for a high-performance primer that performs on damp or 'green' substrates, and a reliable barrier against negative hydrostatic pressure. Its water-based, low VOC formulation means you meet Green Star environmental criteria without compromising on performance. It seals the substrate, inhibits mould, and ensures subsequent layers like membranes or self-levelling compounds bond securely without risk of re-emulsification once cured.
Preparation is key: ensure all surfaces are clean, dry (no surface water), structurally sound, and free from contaminants. Concrete requires 14 days cure, and sand-cement screeds 4 days. Mix Part A and Part B in equal volumes until a uniform colour appears. If thinning is needed for highly porous substrates, do it with water at the initial mixing stage. Apply with a brush or roller, ensuring even coverage. For vapour barrier applications, apply a diluted wash coat first, then minimum two undiluted coats to achieve the required film thickness. Clean tools and spills with water while the product is still wet.
Everflex VBS consistently serves as the foundational step in demanding build-ups. It is the first product applied during substrate preparation, particularly for roofing, balconies, and internal plant rooms, often followed by waterproofing membranes or self-levelling compounds. For waste outlets and penetrations, it primes the area to ensure the subsequent sealing layers, such as a polyurethane joint sealant, achieve optimal bond and moisture resistance.
Yes, Everflex VBS functions as a negative waterproof barrier. It is proven to withstand up to 25 metres (250 kPa) head of water pressure when applied to a minimum dry film thickness of 300 microns.
You can apply subsequent coatings 4-24 hours after Everflex VBS is touch-dry. This recoat window is critical; if missed, an additional coat of VBS is recommended.
No, Everflex VBS has limited UV resistance and is not designed for long-term UV exposure. It must be overcoated with a suitable UV-stable Adheseal topcoat if used in exposed external areas.
Yes, Everflex VBS is suitable for damp concrete substrates. Ensure the surface is free from surface water and continual dampness, and concrete has cured for at least 14 days before application.
| Application | Key benefit | Primary trades |
|---|---|---|
| Negative pressure vapour barrier (up to 25m head of water) | Prevents moisture ingress and subfloor failures in basements or hydrostatic pressure zones, avoiding callbacks. | Waterproofers, concrete contractors, builders |
| Primer for damp concrete and 'green' concrete (after 14 days cure) | Allows application of subsequent systems (waterproofing, self-levelling) sooner, reducing delays and ensuring adhesion. | Tilers, flooring installers, waterproofers |
| Sealing and priming various common and damp substrates | Provides a stable, prepared surface compatible with most building materials, improving bond and system longevity. | Builders, plasterers, general trades |
| Inhibiting mould and biological growth | Creates a hygienic, mould-resistant barrier, contributing to healthier indoor environments and Green Star compliance. | Health and aged care builders, facility managers |
| Primer for timber flooring applications over concrete | Manages residual moisture in concrete slabs to prevent moisture-related timber flooring failures like cupping or delamination. | Timber flooring installers, builders |
The substrate must be clean, sound, dry, and free of all contaminants. Laitance, curing compounds, old adhesives, dust, and grease must be completely removed, typically by mechanical grinding. Ensure all dust is vacuumed from the surface.
This is a two-part product. Combine Part A and Part B in the specified ratios (refer to Technical Data Sheet). Use a mechanical mixer (e.g., drill with paddle) at a low speed (300-400 rpm) to avoid introducing air.
Scrape the sides and bottom of the mixing container thoroughly while mixing to ensure all material is combined. Mix for 3-5 minutes until a completely uniform, streak-free colour is achieved.
Apply the mixed Primer VBS immediately to the prepared substrate. Use a medium-nap roller or brush.
Apply evenly, ensuring a continuous, pinhole-free film to maintain the integrity of the vapour barrier. Work the primer into the substrate to ensure good penetration and adhesion. Observe coverage rates from the TDS.
Signal Word: Warning
Wear rubber boots, gloves (nitrile rubber recommended for intermittent contact), apron, safety glasses, and a respirator. If inhalation risk exists, use an organic vapour/particulate respirator meeting AS/NZS 1715 and AS/NZS 1716 standards.
Ensure adequate ventilation during use. Natural ventilation should be sufficient under normal conditions. If needed, use mechanical ventilation to maintain air concentrations below exposure standards.
Store in a cool, dry, well-ventilated place between 5°C and 35°C, away from direct sunlight and foodstuffs. Keep containers closed and standing upright. Dispose of contents/container according to local, regional, and national regulations. Recycle if possible.
Proper substrate preparation is essential for adhesion and long-term performance, ensuring the product performs as specified.
Surface prep: Concrete must be structurally sound, dry, clean, and free of dust, loose material, oils, grease, curing compounds, and any other contaminants. Non-structural cracks and deformities must be rectified. Concrete must cure for at least 14 days before application. Ensure no surface water or continual dampness.
Primer: Not required, Everflex VBS acts as the primer and vapour barrier in one application.
Surface prep: Screeds must be structurally sound, dry, clean, and free of dust and contaminants. Allow to cure for at least 4 days prior to application. Ensure no surface water or continual dampness.
Primer: Not required, Everflex VBS acts as the primer and vapour barrier.
Surface prep: Surfaces must be sound, dry, clean, and free of loose material. Allow render to cure for at least 4 days prior to application. Ensure no surface water or continual dampness.
Primer: Not required, Everflex VBS acts as the primer and vapour barrier.
Surface prep: Surfaces must be clean, dry, and free of dust and loose materials. Ensure no surface water or continual dampness.
Primer: Not required, Everflex VBS acts as the primer.
Surface prep: Plywood must be clean, dry, and free of dust and contaminants. Ensure no surface water or continual dampness.
Primer: Not required, Everflex VBS acts as the primer.
| Property | Value |
|---|---|
| Product Type | Water Based Epoxy |
| Mix Ratio | 1:1 by weight or volume |
| Pot Life | 2 hours @ 25°C, 1 hour @ 35°C |
| Consistency | Brush-able/Rollable liquid |
| Recoat Time | 4-24 hours |
| Full Cure | 5-7 days @ 25°C and 50% RH |
| Application Temperature Range | 10°C to 35°C |
| Storage Temperature Range | 5°C to 35°C |
| Water Vapour Barrier Permeance | 0.12 g/24hrs/m²mmhg @ 32°C and 50% RH |
| Consumption (General) | 3-8 m²/litre per coat depending on application |
| Consumption (Primer) | 6 m²/litre for 300 microns dry film thickness |
| Consumption (Vapour Barrier) | 5 m²/litre per coat for 2 coats minimum 200 microns dry film thickness per coat |
| Hydrostatic Pressure Resistance | Up to 25 metres (250 kPa) head of water @ 300 microns dry film thickness |
| Shelf Life | 2 years |
| Clean Up (Wet) | Water |
| Colours | Light Grey |
| VOC Content | <5 g/l |
Here are some common examples on where Everflex VBS used by our customers.
