Graphenstone Filler

Graphenstone Filler is useful when preparing walls where repairs or changes in building materials could show through the finishing paint. Typical examples include smooth patches on uneven render or areas where new brickwork meets old. It is applied across the surface as a preparatory coating, rather than worked into individual holes like a conventional repair filler.

Choose it for refurbishment projects where the background needs a more consistent appearance before decorating. Repair larger defects separately and investigate moving or recurring cracks before applying the coating. Once dry, finish with a compatible Graphenstone paint suited to the location.

Suitability

Suitable for correctly prepared interior and exterior mineral surfaces, including plaster, lime plaster and render, brick, concrete and sound existing paintwork. Not intended for filling holes or repairing structural damage.

Explore these Graphenstone paints for your finishing coats, checking suitability for the surface and location.

Product Use Graphenstone GrafClean Matt Paint Washable matt paint for interior walls and ceilings. Graphenstone GrafClean Eggshell Washable low-sheen finish for interior walls, ceilings and suitably primed woodwork. Graphenstone GCS Interior Paint Breathable, wipeable flat matt paint for traditional and contemporary interiors. Graphenstone GCS Exterior Paint Breathable matt paint for exterior walls, render and compatible mineral surfaces. Graphenstone Naturcolor Interior Matt Breathable mineral matt paint for interior walls and ceilings. Graphenstone Siena Decorative limewash for interior walls and ceilings, with natural tonal variation.

Ensure surfaces are dry, sound, securely adhered and free from dirt, dust, grease and other contaminants that could affect adhesion. New mineral surfaces must be allowed to cure for at least 28 days before application.

Please Note: Take care when preparing previously painted surfaces dating from before the 1960s, as they may contain lead. If in doubt, seek specialist advice before sanding or removing the existing coating.

1. Remove loose, flaking or poorly adhered material by scraping and brushing back to a sound surface
2. Clean away dirt, dust, grease and any other surface contamination
3. Remove mould, algae and other organic growth using a suitable cleaning product, such as Barrettine Mould and Mildew Cleaner following its manufacturer's instructions
4. Brush away loose salt deposits and treat persistent efflorescence with a suitable anti-salt treatment that is compatible with mineral coatings
5. Repair holes and cracks measuring 1mm or more with a suitable repair product, like Sandtex Ready Mixed Masonry Filler
6. Allow surfaces affected by rain, washing or cleaning treatments to dry completely before application

Always carry out a test area before starting any project to confirm product suitability, adhesion and final appearance. Do not mix Graphenstone Filler with products from other manufacturers and follow the manufacturer's instructions on the container at all times.

Apply when both the surface and surrounding temperature are between 7°C and 35°C and relative humidity is no higher than 80%. Do not apply in direct sunlight, onto surfaces heated by the sun or when rain is expected before the coating has dried.

1. Protect adjacent surfaces that are not being treated, particularly glass and timber
2. Shake the container before use, then dilute Graphenstone Filler with 5% to 10% clean water
3. Stir thoroughly before and during application, avoiding excessive agitation that could introduce air bubbles
4. Apply one even coat using a brush or roller, such a Osmo Premium Roller, Brush and Tray Set
5. Maintain a wet edge and complete one wall or continuous area at a time to help prevent visible lap marks
6. Use the same dilution throughout and roll as close to edges as possible to minimise picture framing
7. Work the mineral coating out thoroughly to produce an even and consistent textured finish
8. Avoid applying the product too thickly, as this can extend drying times and cause micro-cracking
9. Allow approximately 24 hours to dry at 25°C and 60% relative humidity, allowing longer in cooler or more humid conditions
10. Protect exterior surfaces from rain for at least 24 hours after application

Clean brushes, rollers and other equipment with warm water immediately after use.

Here are some of the most commonly asked questions about Graphenstone Filler.

Is Graphenstone Filler a conventional repair filler?

No. Despite its name, Graphenstone Filler is a textured silicate primer that is applied across a surface before painting. It helps disguise differences in texture, crazing and minor imperfections but is not intended for filling holes or repairing structural damage.

What size cracks will Graphenstone Filler cover?

Graphenstone Filler can cover superficial crazing and hairline cracks measuring less than 1mm. Larger, deeper, moving or recurring cracks should be investigated and repaired with a suitable product before application.

Which surfaces can Graphenstone Filler be applied to?

It can be applied to correctly prepared plaster, lime plaster or render, brick, concrete and securely adhered existing paint. Surfaces must be clean, dry, sound and free from anything that could prevent adhesion.

Can Graphenstone Filler be used indoors and outside?

Yes. It is suitable for interior and exterior surfaces. When working outside, avoid applying it in direct sunlight or when rain is expected and protect the treated surface from rain for at least 24 hours.

Does Graphenstone Filler need to be diluted?

Yes. Dilute the product with 5% to 10% clean water and stir thoroughly before and during application. Use the same dilution throughout each continuous area to help maintain a consistent finish.

Can Graphenstone Filler be sprayed?

The current technical data sheet specifies application by brush or roller. Although some Graphenstone information mentions airless application, confirm the correct spray equipment and settings with the manufacturer before attempting to spray the product.

How long does Graphenstone Filler take to dry?

Allow approximately 24 hours at 25°C and 60% relative humidity. Lower temperatures, higher humidity or heavy application can extend the drying time. Ensure the coating is completely dry before applying a compatible finishing paint.