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 to be applied before the application of EWI-Pro mineral, acrylic and mosaic renders. 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:

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

Quantity to be used: approx. 0.2-0.3 kg/m2 (depending on substrate structure and absorbency)

Directions for Use:

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 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.


Wash tools right away with clean water.


21kg plastic buckets


Shelf life: up to 12 months from the date of manufacture. Keep dry and in the original packaging at a temperature of +5°C to +25°C.

Safety Measures:

Avoid contact with skin. Wear eye protection. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. After contact with skin, wash with water. Wear suitable protective gloves and clothing.

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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