Graphenstone Ambient Primer L42

Graphenstone Ambient Primer L42 is used during preparation when cleaning alone leaves a surface slightly chalky, or when different materials absorb paint at different rates. It is useful for renovation projects involving older masonry, lime plaster and render, as well as securely adhered existing paintwork.

Choose it where the condition of the background calls for additional preparation before applying a compatible Graphenstone finish. It is a preparatory treatment rather than a decorative coating, so follow it with the paint suited to your project.

Suitability

Suitable for interior and exterior lime plaster and render, brick, concrete and securely adhered existing paintwork. Remove loose or flaking material before application and check the preparation requirements for the chosen finishing paint.

Explore these Graphenstone paints for your finishing coats, checking the preparation requirements for each product and surface.

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 Ambient Pro+ Air Purifying Matt Paint Lime-based matt paint for interior and exterior walls, with light-activated air-purifying properties. Graphenstone Naturcolor Interior Matt Breathable mineral matt paint for interior walls and ceilings. Graphenstone Siena Decorative limewash for interior walls and ceilings, with natural variations in tone.

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.

1. Remove loose, flaking or poorly adhered paint by scraping and brushing the surface thoroughly.
2. Take extra care when removing paint applied before the 1960s, as it may contain lead. Seek professional advice if you are unsure.
3. Fill cracks, holes and other imperfections with a suitable interior or exterior filler, such as Sandtex Ready Mixed Masonry Filler. Allow the filler to dry before sanding it smooth.
4. Allow new plaster, brick, concrete and other mineral surfaces to cure for at least 28 days before application.
5. Lightly sand glossy or particularly smooth existing paintwork to provide a key, then remove all sanding dust.
6. Treat mould, algae and other organic growth with a suitable cleaning treatment, like Sandtex Fungicidal Wash, then allow the surface to dry completely.
7. 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.
8. Allow exterior surfaces to dry fully following rain and ensure no further rain is expected during application or the following 24 hours.

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.

1. Protect surrounding glass, timber and other surfaces that are not being treated.
2. Shake the container thoroughly before use to ensure the primer is evenly mixed.
3. Dilute Graphenstone Ambient Primer L42 with clean water at a ratio of 1:1 and mix thoroughly.
4. Apply one even coat using a brush, roller or airless spray equipment. On vertical surfaces, work from the bottom upwards to help prevent runs.
5. Allow the primer to dry for approximately 24 hours before applying a compatible finishing paint. Drying may take longer in cool or humid conditions.
6. For exterior projects, protect the treated surface from rain for at least 24 hours after application.
7. Clean brushes, rollers and other equipment with warm water immediately after use.

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.

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.