ewi330-25-2-www EWI-330 Mineral & Acrylic Primer - 21kg

EWI-330 Mineral & Acrylic Primer – 21kg

£50.40 (incl VAT)

In stock (can be backordered)

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This deep-penetrating primer is designed for final preparation of surfaces prior to applying EWI Pro mineral, acrylic and mosaic renders. It strengthens the substrate, limits and balances its absorptive capacity without compromising breathability. It facilitates rendering plaster coats and enhances their adhesion to substrates. EWI-330 can be pigmented to match the colour of the render.

  • Waterproof
  • Frost-proof
  • Vapour-permeable
  • Increases groundwork adhesion
  • Facilitates plaster application
  • Solvent-free

Also available in 7kg tubs – you can find out more information about them here.

Intended Uses

This deep penetrating primer is designed for final preparation of surfaces prior to applying EWI-PRO  mineral, acrylic and mosaic render. It reduces the absorptive capacity of  the substrates and aids the adhesion of the render.

Technical Specifications

Composition: A water based primer containing acrylic polymers, quartz aggregate, pigments and enhancers

Bulk density: approx. 1.50 g/cm³

Application Conditions for Mineral & Acrylic Primer

  • Application temperature (air, substrate, materials): from +5°C to +25°C
  • Coat drying time: approx. 4 hours
  • Time to plastering: approx. 24 hours after priming
  • Colour: white or another render-matching colour (recommended for render with scratch-effect finish)
  • Quantity to be used: approx. 0.2-0.3 kg/m2 (depending on substrate structure and absorbency)

Applying Mineral & Acrylic Primer

Substrate Preparation: All substrates must have appropriate load-bearing capacity, be compact, stable, even, free of dust, grease, anti-adhesive agents, remaining paint, mould, algae, moss, etc., scratches and salt efflorescence and uniformly dry. All contamination resulting from grease, oil, anti-adhesive agents should be cleaned by  washing with water containing detergent. The surface should be cleaned with a wire brush to avoid biological contamination. Scratched and cracked surfaces should be repaired with repair and patching mortar. Mortar applied to repaired sites should be dry and well-bonded. Highly absorptive and sandy substrates should be covered with EWI-301 and allowed to dry for at least 12 -24 hours prior to priming with EWI-330. Surfaces that will not be rendered should be protected prior to priming.

Product preparation: Mix thoroughly before use. The primer must not be thinned with water or mixed with any other materials.

Application: Apply EWI-330 primer uniformly to the substrate by painting method using a roller or brush and allow to dry. Render should be applied only after the primed surface is allowed to dry for 24 hours. Works must not be carried out at ambient temperatures below +5°C, works on elevations must not be carried out during rain or snow, strong winds and in direct sunlight, without special shields to limit exposure to weather conditions. Recently rendered coats must be protected against rain, frost and over-rapid drying.

Caution! The colour of the render primer may be slightly different from render colour itself when the same pigments are used.


Ensure that you wash your tools right away with clean water after use. Do not dispose of the product along with household rubbish. Ensure that the empty buckets are washed clean of any residual product before recycling. Do not allow any of the leftover product to reach sewage or watercourse systems.


7kg plastic buckets

Storage of Mineral & Acrylic Primer

Shelf life: up to 12 months from the date of manufacture. Store in a cool dry place at a temperature ranging from +5°C to +25°C. Once open, keep the product sealed and in the original packaging.

Safety Measures for Mineral & Acrylic Primer

Avoid contact with skin as the product may cause skin irritation. Wear eye protection. In case of contact with eyes, rinse the eyes immediately with plenty of water and seek medical advice. After contact with skin, wash with water. Wear suitable protective gloves and clothing. Always ensure that water/washing facilities are available onsite in case of emergency. Mineral & Acrylic Primer is fire resistant, so will not need extinguishing in the event of a fire.

Compliance with Standards

European Technical Approval No. ETA-07/0192 and European Technical Approval No. ETA-07/0118

SKU: EWI-330-21
Weight 21 kg


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