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Graphenstone Ambient Primer L42
A clear, breathable primer that stabilises dusty and chalky surfaces while regulating absorption for a more even paint finish.
Features
- Consolidates absorbent, dusty and chalky surfaces to provide a sound base for painting.
- Regulates surface porosity to reduce uneven absorption and help topcoats achieve a more consistent finish.
- Improves adhesion over existing paintwork, helping subsequent coats bond effectively to the surface.
- Colourless formulation prepares the surface without interfering with the colour of the chosen topcoat.
- Suitable for interior and exterior lime plaster and render, brick, concrete and previously painted surfaces.
- One-coat application provides approximately 30m² coverage per litre, while Class 1 breathability and trace VOCs support vapour-open decorating systems.
Brand
Drying time
24 hrs
Coverage
Up to 35 m2 per litre
No. of coats
1
Size
1L
4L
MPN
Please Select Size/Option
GTIN
Please Select Size/Option
Overview
Graphenstone Ambient Primer L42 provides the foundation for compatible Graphenstone finishing paints on surfaces that are difficult to decorate because of dustiness, chalking or uneven absorption. Unlike a pigmented undercoat, it remains colourless and is intended to stabilise the existing surface rather than hide it. By regulating porosity, it helps subsequent paint coats spread and dry more evenly, particularly across repaired areas, older masonry and surfaces containing materials with different absorption rates.
Suitability
Suitable for interior and exterior lime plaster and render, brick, concrete and securely adhered existing paintwork. It is particularly useful on absorbent mineral surfaces and areas that remain slightly dusty after cleaning. Graphenstone Ambient Primer L42 is not a finishing coat and should be covered with a compatible paint after drying for approximately 24 hours.
To compare compatible finishes and specialist paints, explore the Graphenstone product guide below.
| Product | Use |
| Graphenstone GrafClean Matt Paint | Suitable for interior walls and ceilings where a durable, washable 4% matt finish is required |
| Graphenstone GrafClean Eggshell | Suitable for walls, ceilings and primed woodwork where a washable, low-sheen finish is required |
| Graphenstone Ambient Pro+ Air Purifying Matt Paint | Photocatalytic lime paint for interior and exterior walls that helps reduce certain airborne pollutants |
| Graphenstone NaturColor Interior Matt | Suitable for interior walls and ceilings where a highly breathable, natural mineral matt finish is required |
Preparation
Preparation
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Surfaces should be clean, dry, firm and securely adhered before applying Graphenstone Ambient Primer L42. Remove any material that could affect penetration or adhesion, including dust, dirt, grease, loose paint and organic growth.
- Remove loose, flaking or poorly adhered paint by scraping and brushing the surface thoroughly.
- Take extra care when removing paint applied before the 1960s, as it may contain lead. Seek professional advice if you are unsure.
- Fill cracks, holes and other imperfections with a suitable interior or exterior filler. Allow the filler to dry before sanding it smooth.
- Allow new plaster, brick, concrete and other mineral surfaces to cure for at least 28 days before application.
- Lightly sand glossy or particularly smooth existing paintwork to provide a key, then remove all sanding dust.
- Treat mould, algae and other organic growth with a suitable cleaning treatment, then allow the surface to dry completely.
- Remove any white, powdery salt deposits (efflorescence) with a dry, stiff brush. If they return, investigate and resolve the source of moisture before priming. Treat persistent deposits with a suitable salt-neutralising product.
- Allow exterior surfaces to dry fully following rain and ensure no further rain is expected during application or the following 24 hours.
Application
Application
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We recommend trialling a test area before starting your project to check suitability and compatibility. Apply in temperatures between 7°C and 32°C, with relative humidity below 80%. Avoid applying in direct sunlight or to hot surfaces.
- Protect surrounding glass, timber and other surfaces that are not being treated.
- Shake the container thoroughly before use to ensure the primer is evenly mixed.
- Dilute Graphenstone Ambient Primer L42 with clean water at a ratio of 1:1 and mix thoroughly.
- Apply one even coat using a brush, roller or airless spray equipment. On vertical surfaces, work from the bottom upwards to help prevent runs.
- Allow the primer to dry for approximately 24 hours before applying a compatible finishing paint. Drying may take longer in cool or humid conditions.
- For exterior projects, protect the treated surface from rain for at least 24 hours after application.
- Clean brushes, rollers and other equipment with warm water immediately after use.
Aftercare
Aftercare
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Overcoating
Allow Graphenstone Ambient Primer L42 to dry for approximately 24 hours before applying a compatible Graphenstone finishing paint. Ensure the primed surface is clean and dry before overcoating.
Maintenance
Graphenstone Ambient Primer L42 is a preparatory product and should not be left as the final finish. Once overcoated, follow the cleaning and maintenance guidance supplied with the chosen finishing paint.
If the surface is damaged or exposed during future maintenance, clean and prepare the affected area before applying additional primer and restoring the finishing coats.
F.A.Q.
F.A.Q.
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Here are some of the most commonly asked questions about Graphenstone Ambient Primer L42.
What is Graphenstone Ambient Primer L42 used for?
It is a clear stabilising primer for absorbent, dusty or chalky surfaces. It consolidates the substrate, regulates absorption and helps compatible finishing paints adhere more effectively.
Which surfaces can Ambient Primer L42 be applied to?
It is suitable for common construction surfaces, including lime plaster and render, brick, concrete and securely adhered existing paintwork however this is NOT suitable from gypsum plasters. The surface must be clean, dry, sound and correctly prepared.
Can it be used indoors and outdoors?
Yes, Ambient Primer L42 is suitable for interior and exterior surfaces. When applying it outdoors, protect the treated surface from rain for at least 24 hours.
Does Ambient Primer L42 dry clear?
Yes, it is a colourless primer that dries without obscuring the underlying surface. It must be covered with a compatible finishing paint and should not be used as a standalone finish.
Does Graphenstone Ambient Primer L42 need diluting?
Yes. Shake the primer thoroughly and dilute it at a ratio of one part primer to one part clean water before application.
How many coats of Ambient Primer L42 are required?
One evenly applied coat is normally required. Highly absorbent or unusual surfaces should be tested first to confirm their suitability and the required preparation.
How long should Ambient Primer L42 dry before painting?
Allow the primer to dry for approximately 24 hours before applying a compatible finishing paint. Drying may take longer in cool, damp or poorly ventilated conditions.