For sealing green concrete, priming damp substrates, or blocking rising damp, Everflex VBS Water-based Epoxy Primer provides a high-density moisture barrier. This two-part water-based epoxy controls negative hydrostatic pressure up to a 25-metre head of water, preventing moisture migration from destroying timber flooring, polyurethane membranes, and floor coatings.
Everflex VBS forms a low-permeability barrier that blocks water vapour and liquid water pressure from the negative side of the substrate. Once fully cured, the water-based epoxy film does not re-emulsify when exposed to moisture. The formulation also inhibits the growth of mould and biological organisms. When used as a vapour barrier system, the dried film must reach a minimum thickness of 0.33mm (330 microns) to achieve its rated 0.12g/24hrs/m²mmHg permeance rating and resist up to 250kPa of hydrostatic pressure.
Everflex VBS is suitable for internal and external applications on the following structurally sound substrates:
This primer is formulated for subsequent application of:
Substrates must be clean, stable, free of surface water, and free of form release agents or curing compounds. Mix Part A and Part B in a 1:1 ratio with an electric mixer. Pot life is 2 hours at 25°C, reducing to 1 hour at 35°C.
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 Water-based Epoxy Primer used by our customers.
