Graphenstone GCS Exterior Premium

Non Hazardous
A silicate lime based paint with a matte colour finish suitable for use on exterior walls.
Available in 1, 4 and 10 Litres
From £32.04 £26.70
In stock
Only %1 left
Product Description

Graphenstone GCS Exterior Premium is a silicate lime based paint with a mineral matte colour finish which is suitable for exterior walls.

Best Uses

Graphenstone GCS Exterior is a class 1 vapour open, premium ecological, natural mineral and silicate based paint for exterior use. Ideally suited for use in heritage buildings , older properties and building facades, where a traditional mineral finish and fully breathable paint system is required. 

Classified as A2 -s1, d0, GCS Exterior is also fire resistant, recommended for projects that require materials that resist the spread of flame.

  • Flat matt – <2% sheen.
  • Trace VOCs – less than 0.1%
  • Breathable – Class 1 vapour open; reduces condensation & allows walls to ‘breathe’
  • Traditional – classic mineral texture
  • Colour fast – Metal oxide pigments used for maximum colourfastness and stability
  • Non-combustible – rated A2 -s1, d0 (specification required)
  • Excellent coverage – 10-14m2/L per coat
  • Colour selection - Tintable into 45 House Colours and some NCS and RAL

Graphenstone GCS Exterior Premium contains Graphenstone Technology, so as well as being tough and long lasting, it is free of all toxic substances and also highly breathable, therefore avoiding condensation.


The substrate must be dry, firm, well adhered, even and free of any impurities that could hinder the perfect bonding of the product. Mineral substrates must be at least 28 days old.

Ensure the substrate to be painted is thoroughly cleaned with any organic growth and/or other impurities removed by thorough cleaning using specific products for this purpose.

Depending on the nature of the surface, the actions prior to application of the paint vary as follows:

  • Old glossy or satin paints and putties: clean the surface and sand softly.
  • Absorbent substrates (e.g. concrete block or brick): apply Graphenstone Ambient Primer Premium.
  • If the substrate is wood, metal (without corrosion or oxidation) or non-porous (e.g. glazed tiles, phenolic panel, epoxy or polyurethane paints): apply Graphenstone Four2Four Premium.

Shake and dilute the product with water using 10-15% per litre (Approx. 150-200ml water p/L or 19-26 fl. oz. of water p/Gal of paint). Ensure good mixing. Avoid excessive shaking to minimise bubble occlusion.

On transparent bases, or intense colours, dilute with water at 5-10% of the weight of the product (approx. 100-150 ml of water per litre of product).

The recommended application method is by Roller, Brush or Airless Spray.

Technical Details

Approvals and Certificates

  • EPD
  • Certified Cradle to Cradle Silver
  • Global Green Tag
  • HPD/Green Tag Health Platinum
  • Relevant to BREEAM, LEED & WELL

Technical Info

Components: Single Pack
Type: Silicate Lime Paint
Finish: Matt
Stock Colours: Graphenstone Colour Range (96 colours)
Tintable: Yes. Offered in colour according to NCS 322. Please note, bespoke tints are non refundable / exchangeable
VOC Content: < 1 g/l
Volume Solids: 52 ± 5 %
Suitable Substrates: Plaster, gypsum, mortars, old paint, prefabricated panels and unlaminated wallpaper, brick or perlite
Application Method: Brush, Roller, Airless Spray
Theoretical Coverage: 5-8 m2/L
Wet Film Thickness (WFT): -
Dry Film Thickness (DFT): -
Overcoatable: 2-4 hours between coats at 25°C
Fully Cured: 30 days at 25°C
Cleaner / Thinner: Clean tools after use with warm water.
Shelf Life: 18 months from date of manufacture, unopened
Packaging: Available in 1, 4 and 1 Litres

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