For prep work on substrates with varying absorption rates, Everflex Multi-Prime Acrylic Primer is a single-part, water-based acrylic primer that stabilises both porous and non-porous surfaces. It is formulated to prepare substrates for the application of Everflex waterproofing membranes, self-levelling compounds, cement-based ceramic tile adhesives, and grouts in both internal and external environments.
Everflex Multi-Prime functions as an adhesion promoter and surface sealer. It dries to a tack-free, translucent green film that indicates uniform coverage. The solvent-free, low-VOC formula is non-corrosive and contains active agents that inhibit mould, mildew, and biological growth in hot and humid environments. It can be applied neat on non-porous substrates to form a bonding bridge, or diluted with water to penetrate and control the absorption of porous substrates, preventing the rapid loss of water from subsequent levelers or adhesives.
The primer is compatible with a wide range of structural and finishing substrates, provided they are clean and dry:
To determine substrate porosity, place a puddle of water the size of a one-dollar coin on the surface. If the water absorbs in less than two minutes, the substrate is porous; if the puddle remains, it is non-porous.
Porous substrates: Dilute 1 part Multi-Prime with 2 parts clean water. Apply by brush, roller, or spray, ensuring the primer remains wet on the surface for 2 minutes to achieve penetration. For exceptionally porous substrates, apply a second coat diluted 1 part primer to 3 parts water, allowing 30 minutes of curing time between coats. Adheseal WBP may be used as an alternative for porous concrete applications.
Non-porous substrates: Apply an even layer of neat, undiluted Multi-Prime using a roller or brush. For extremely non-porous surfaces (such as burnished concrete or ceramic tiles), perform a light grind or sand first to mechanically enhance adhesion.
Clean tools and wet spills immediately with water. Cured material must be removed by mechanical means.
Yes, Everflex Multi-Prime is formulated for both porous and non-porous substrates, simplifying primer selection on varied job sites. Dilute it for porous surfaces and apply it neat for non-porous surfaces as directed.
Allow approximately 1 hour at 23°C for the primer to dry to a translucent, tack-free film before applying subsequent coatings. This fast dry time helps maintain site sequencing.
Yes, for extremely non-porous substrates like burnished concrete or ceramic tiles, a light grind or sand is recommended. This mechanical preparation enhances adhesion by creating a suitable surface profile.
Do not apply Everflex Multi-Prime on damp, wet, or contaminated substrates, or if rain is imminent. It is not suitable for areas with hydrostatic pressure or rising damp. The product has limited UV resistance and must be overcoated for long-term exposure.
| Application | Key benefit | Primary trades |
|---|---|---|
| Priming for waterproofing membranes | Ensures reliable adhesion for Everflex waterproofing systems on diverse substrates, resisting mould and mildew. | Waterproofers, Builders |
| Priming for self-levelling compounds | Promotes even absorption and bond of levelling compounds, preventing pinholes and delamination on concrete and screeds. | Floor Preparers, Tilers |
| Priming for cement-based tile adhesives and grouts | Establishes a strong, consistent bond to various building materials, reducing bond failure and callbacks for tiling. | Tilers |
| Universal primer for porous and non-porous surfaces | Streamlines site logistics by using one product across concrete, timber, masonry, and pre-cast, reducing product switching and error. | General Builders, Renovators |
Ensure substrates are dry, clean, structurally sound, and free from oils, dust, curing compounds, or any contaminants. Cure times vary—e.g. 28 days for concrete and 4 days for render/screed.
Use diamond grinding or sanding for difficult or smooth substrates. Avoid acid etching.
Vacuum dust thoroughly. Remove surface water or continual dampness before priming.
Dilute Everflex Multi-Prime 1:2 with clean water for general porous surfaces (e.g. cured concrete). Apply with roller or brush ensuring complete coverage.
Use a 1:3 dilution for very porous surfaces and apply a second coat if needed.
Dilute 1:2 with water and apply a single even coat.
Use Everflex Multi-Prime undiluted (neat) for non-porous substrates like ceramic tiles, burnished concrete or waterproof membranes.
Light sanding or mechanical abrasion may enhance bond strength on high-gloss tiles or sealed surfaces.
Apply a single neat coat with brush or roller ensuring a uniform, opaque film across the surface.
Wear overalls, gloves, and safety glasses. Remove contact lenses after an eye injury. Wash hands thoroughly before eating, drinking, or using the toilet. Wash contaminated clothing before re-using.
Natural ventilation should be adequate under normal use conditions. Use in a well-ventilated area.
Avoid contamination of water, foodstuffs, feed, or seed. Clean tools and spills with water while the product is wet. Dispose of cured product by mechanical means or in a licensed landfill, or incinerate if permissible. Consult local authorities for specific disposal regulations.
Proper surface preparation is crucial for adhesion and preventing project failures. This guide outlines requirements for common substrates.
Surface prep: Allow concrete to cure for at least 28 days. Substrate must be structurally sound, dry, clean, and free of contaminants. Mechanical preparation like dry diamond grinding may be required to roughen the surface and remove impurities. Vacuum thoroughly to remove all dust.
Primer: Required. Dilute 1 part Everflex Multi-Prime with 2 parts clean water for typical concrete. Apply by brush, roller, or spray, ensuring the surface remains wet for 2 minutes. Exceptionally porous concrete may need a second coat diluted 1 part primer with 3 parts water. Allow 30 minutes for curing between coats.
Surface prep: Sand cement screeds must be a 3:1 ratio and allowed to cure for at least 4 days. Masonry and render require a minimum 4-day cure. Ensure surfaces are sound, dry, clean, and free from loose material or contaminants.
Primer: Required. For these porous substrates, dilute 1 part Everflex Multi-Prime with 2 parts clean water. Apply ensuring full coverage and a 2-minute wet time. A second, more diluted coat (1:3 with water) might be necessary for very porous areas. Allow 30 minutes cure time between coats.
Surface prep: Ensure boards are structurally sound, dry, clean, and free of dust or oils. Remove any flaking material.
Primer: Required. Dilute 1 part Everflex Multi-Prime with 2 parts clean water. Apply ensuring full, even coverage. Allow 30 minutes for curing between coats if a second coat is needed for highly absorbent sections.
Surface prep: Surfaces must be sound, dry, clean, and free from dust, grease, or other contaminants. Ensure the timber is stable.
Primer: Required. Dilute 1 part Everflex Multi-Prime with 2 parts clean water. Apply to ensure consistent absorption. Allow 30 minutes for curing between coats if a second application is deemed necessary.
Surface prep: Ensure surfaces are clean, dry, and free of contaminants. For extremely non-porous surfaces like burnished concrete or ceramic tiles, a light grind or sand is recommended to enhance adhesion. Do not use on ceramic tiles with a high gloss coating unless mechanically prepared.
Primer: Required. Apply Everflex Multi-Prime NEAT (undiluted) in an even layer with a roller or brush, ensuring uniform colour. No dilution is necessary.
| Property | Value |
|---|---|
| Product Family | Everflex |
| Base Chemistry | Water-based Acrylic Polymer |
| Application Temperature Range | 10-35°C |
| Cure Time | 1 hour (to translucent film at 23°C) |
| Coverage Rate | 5-10 m² per litre (varies with porosity) |
| VOC Content | Low VOC |
| Colour | Green (RAL 6034) |
| Dilution For Porous Substrates | 1 part Multi-Prime to 2 parts water (first coat), 1 part Multi-Prime to 3 parts water (second coat if needed) |
| Dilution For Non-Porous Substrates | Neat (undiluted) |
| Compatibility | Most Adheseal Tile Adhesives, Floor Levelling Compounds, Grouts, and Waterproofing Membranes |
| Mould Resistance | Resists mould and mildew in hot and humid environments |
| UV Resistance | Limited (must be overcoated) |
Here are some common examples on where Everflex Multi-Prime Acrylic Primer used by our customers.
