Atlas Bejca Sealer Ebony 4L — Deep Black Wood-Tone Impregnant for Decorative Render

Product Overview

Atlas Bejca Sealer 09 Ebony 4L covers approximately 26–40 m² per coat at a consumption rate of 0.10–0.15 kg/m², delivering the deepest, darkest wood tone available in the Bejca range to decorative mineral renders. Designed as the finishing component of the Atlas wood-effect facade system within the concrete effect render range, this staining impregnant transforms Atlas Cermit WN render into a striking dark-timber finish that commands attention on feature panels, entrance facades, and contemporary elevations. Zero sanding, zero oiling, and no timber replacement — just a maintenance-free surface for the full service life of the coating.

Your facade gains bold visual impact and lasting weather protection from a single product — Atlas Bejca's silicone-resin and polymer dispersion formula creates a semi-transparent, hydrophobic coating that actively resists UV degradation and atmospheric soiling. The 4-litre tin needs no mixing or thinning — apply straight from the container, with each coat drying in approximately 30 minutes and the finish reaching early rain resistance after 24 hours, so you can complete a full facade panel in a single working day and trust the finish to hold through overnight weather.

Key Benefits

• Boldest Wood Tone in the Range: Semi-transparent pigments replicate the near-black depth of natural ebony, giving your facade a dramatic, high-contrast timber aesthetic that stands out against lighter render panels and brickwork. The pigment blend includes UV-stable inorganic components, so the dark tone holds its richness over its full service life with no fading toward grey.
• Weatherproof Hydrophobic Protection: Silicone resin content significantly reduces surface water absorption, so rain beads off rather than soaking in — keeping dust and dirt from settling into render grooves and preserving the clean, defined appearance of the finish through every UK season.
• Fast Application, Same-Day Progress: Each coat dries in approximately 30 minutes, allowing you to apply multiple coats in a single session and move on to the next section without delays. A full facade panel can be sealed and colour-finished within one working day, reducing scaffold hire time.
• Flexible, Crack-Resistant Coating: The coating stays flexible after curing, moving with the natural seasonal expansion of your wall (typically ±0.5 mm on a standard panel — an invisible amount, but enough to crack a rigid coating) thanks to a polymer dispersion binder that remains elastic long term — so the colour coat stays intact season after season without micro-cracking.
• Broad Substrate Compatibility: Works on Atlas Cermit WN wood-effect render, standard concrete substrates, all mineral renders (smooth or textured), gypsum render and putty, and plasterboard — making it suitable for both exterior facade feature panels and interior accent walls where a bold, dark wood statement is the design intent.

Technical Specifications

Parameter	Value
Colour	09 Ebony (semi-transparent deep black wood tone)
Pack Size	4 litres
Density	1.02 g/cm³
Average Consumption	0.10–0.15 kg/m² per coat
Approximate Coverage (per coat)	26–40 m²
Drying Time	Approx. 30 minutes
Early Rain Resistance	After approx. 24 hours
Binder System	Polymer dispersions + silicone resins
Available Colours in Range	10 shades (rosewood, alder, walnut, oak, teak, mahogany, stone pine, birch, ebony, acacia)
Application Temperature	+5 °C to +25 °C
Application Method	Brush, roller, or sponge (manual)
Compatible Primary Substrate	Atlas Cermit WN decorative render
Additional Compatible Substrates	Concrete, mineral renders, gypsum render, plasterboard
System Compatibility	ATLAS ETICS and ATLAS ROKER EWI systems

Application & Compatibility

A professional ebony-effect finish requires just three layers — primed substrate, stamped Atlas Cermit WN render, and this sealer coat — with the render cured for a minimum of 3 days at +20 °C and 50 % relative humidity before sealing. In typical UK conditions — where ambient temperatures regularly sit between +8 °C and +15 °C — extending the curing window to 5–7 days gives the most reliable bond. Once the render has hardened, Atlas Bejca 09 Ebony is brushed or rolled directly onto the textured surface in thin, even coats, each layer building the characteristic near-black depth into the wood-grain pattern.

• Substrate Preparation: A clean, fully cured Cermit WN surface gives you the most uniform sealer bond — remove any dust or loose particles before application so the polymer-silicone film bonds evenly across the entire panel without trapping debris beneath the dark pigment.
• Coat Application: Apply each coat at 0.10–0.15 kg/m² using a soft brush or medium-nap roller. Work the sealer into the stamped grooves to ensure the wood-grain pattern receives even colour saturation. Allow approximately 30 minutes between coats.
• Number of Coats: One coat delivers a rich, deep charcoal wash with visible grain texture showing through. A second coat pushes the tone to full ebony depth — almost opaque in the grooves while remaining semi-transparent on the raised grain ridges, creating the high-contrast light-and-shadow effect that makes ebony the most dramatic finish in the range.
• Weather Window: Applying between +5 °C and +25 °C with no rain forecast for 24 hours after the final coat gives the polymer film ideal curing time to reach full hydrophobic performance.

For a complete guide to the wood-effect facade process — from priming through to final sealer coat — see the sealers for concrete effect renders guide. The full application sequence, including stamp technique and Atlas anti-adhesion release agent usage, is covered in the concrete effect render application guide.

Installation Notes

For the cleanest result, work the sealer into the stamped grooves with a soft-bristle brush before smoothing the flat areas with a roller — rather than rolling the entire surface first and then trying to push product into the recesses. This groove-first technique matters most with ebony because the dark pigment makes even minor pooling or missed spots highly visible once dry, which is why the groove-first method pays off most with this shade — it ensures every recess is evenly saturated on the first pass, so the second coat builds depth uniformly without correction. Stir the product gently before use and at regular intervals during application to keep the semi-transparent pigments evenly distributed throughout the tin. Two thin, controlled passes always deliver a more uniform ebony finish than one heavy coat — the first pass establishes the base depth and reveals any areas that need extra attention, while the second pass locks in the final tone evenly across the full panel.

Trade Insight: Installer's Note

Ebony delivers the most striking finish in the Bejca range, and the technique for achieving it consistently is straightforward — I always keep my first coat at exactly 0.10 kg/m² and inspect the full panel in natural daylight before the second pass. The dark pigment builds density rapidly on white Cermit WN, so a conservative first coat lets you spot thin areas and roller marks while correction is still straightforward. A standard second coat at 0.12–0.15 kg/m² then brings the panel to full ebony depth with consistent coverage across every groove and flat section. On south- and west-facing elevations, ebony absorbs more solar energy than lighter tones — applying during the cooler hours of the day (before 11:00 or after 15:00 in summer) gives the polymer film a steadier curing environment and produces the most even, streak-free surface.

Is This Product Right for You?

• Yes — if you want the darkest, most dramatic timber facade: Atlas Bejca 09 Ebony delivers a near-black wood finish that protects your render with a hydrophobic, UV-stable coating — ideal for contemporary feature panels, entrance facades, or interior accent walls where maximum visual contrast is the design goal.
• Need a lighter or warmer wood tone? The Atlas Bejca Teak 4L delivers a classic mid-tone hardwood appearance, while the Atlas Bejca Walnut 4L produces a rich, dark brown for a natural timber effect — both offer the same application method and full system compatibility with a less dramatic visual impact.
• Looking for a non-wood decorative finish? Atlas Silkon BA concrete effect silicone render delivers the same weatherproof performance with a smooth, industrial concrete aesthetic — a single-product finish with no multi-step stencilling or sealing required.

Frequently Asked Questions

How much Atlas Bejca Ebony do I need for my project?

Each 4-litre tin covers approximately 26–40 m² per coat, depending on the porosity of the cured Cermit WN surface and your application thickness. For a standard two-coat finish on a moderately absorbent substrate, plan for roughly 13–20 m² of finished facade per tin. Measuring your wall area in advance and ordering one extra tin for a large project ensures you can complete the job without interruption — keeping a spare tin on site is particularly worthwhile with ebony because unbroken coverage across the full panel is what gives the finish its dramatic, seamless impact.

Does the ebony shade absorb more heat on south-facing walls?

All dark-coloured facade finishes absorb more solar radiation than lighter tones, and ebony sits at the deepest end of the Bejca spectrum. In practice, the thin semi-transparent sealer coat sits on top of a mineral render substrate with substantial thermal mass, so surface heat dissipates into the wall build-up rather than concentrating at the coating film. Applying during cooler hours and ensuring the full 24-hour rain-free curing window gives the polymer film the steady conditions it needs to reach full performance. For large south-facing elevations where solar heat load is a primary concern, pairing Cermit WN with a lighter Bejca shade — or specifying a silicone render with built-in solar protection — gives you an additional margin of thermal safety.

How long does the ebony colour last on an exterior facade?

The UV-stable pigment blend and hydrophobic silicone-resin barrier maintain colour fidelity for 5–12 years under normal UK weathering conditions, depending on elevation exposure and orientation. Ebony's deep pigment concentration gives it strong initial colour density, though fully exposed south- and west-facing panels may lighten slightly more visibly over the first 12–18 months than mid-range tones because the contrast between original and lightened shade is more perceptible to the eye. Periodic cleaning with low-pressure water removes atmospheric deposits and keeps the finish looking crisp, with no specialist impregnation required.

Is Atlas Bejca Ebony suitable for interior feature walls?

Atlas Bejca works on interior substrates including gypsum render, plasterboard, and mineral renders, making it a practical choice for feature walls, reception areas, and commercial interiors where a dark-wood finish creates a bold design statement. The low-odour, water-based formula keeps the workspace comfortable during application, and the ebony shade adds a high-impact contemporary accent that pairs well with neutral walls and natural light.

Is Atlas Bejca Ebony environmentally responsible?

Atlas Bejca is a water-based formulation with low volatile organic compound (VOC) content, producing minimal fumes during application and making it safe for both exterior and interior use without specialist ventilation. Each 4-litre tin covers 26–40 m² per coat — significantly less material per square metre than traditional oil-based wood stains or thick-film coatings, which means less packaging waste and lower transport weight per project. The long service life of the sealed finish (5–12 years before recoating) reduces the total number of maintenance cycles over the building's lifetime, lowering the cumulative environmental footprint compared to natural timber cladding that requires annual oiling or staining.