Description
Atlas Bejca Walnut is shade 03 of the ten-colour Atlas Bejca range, a mid brown that sits between the pale birch and the near-black ebony Renders World also stocks. It is a semi-transparent tinted impregnant for Cermit WN wood-texture render, supplied in a 4-litre pack covering 16–20 m² a coat.
What Atlas Bejca Walnut Is
Bejca has one purpose: a thin coloured protective coating on Cermit WN decorative render, the surface pressed into the texture of natural timber. Semi-transparent pigments of high UV resistance carry the tone, helped by small additions of inorganic pigments, and because the film is semi-transparent the cured shade of the render underneath joins in. On a mid brown that matters: the same pack over a grey Cermit WN and over a white one does not finish the same.
- Binder: low-molecular polymer dispersions blended with silicone resins.
- Permitted backgrounds: Cermit WN, concrete, mineral renders of every kind, gypsum plasters and fillers, plasterboard.
- Shade 03 of ten: 01 alder, 02 pine, 03 walnut, 04 oak, 05 mahogany, 06 tekwood, 07 rosewood, 08 birch, 09 ebony, 10 acacia.
Atlas Bejca Walnut comes in a 4-litre pack, storage life 12 months from the production date printed on it.
The Aged-Plank Finish, in Two Stages
Atlas publishes a second method for this coating, and it is the one that turns a new wall into old boarding. It runs in two stages and the order is not optional.
- Atlas Bejca Walnut goes on and is worked back with a sponge while the film is still open, so the tone lifts off the raised grain and stays in the hollows. The panel is left to dry fully.
- A coat of transparent Bejca goes over the whole surface to protect it.
Two things follow from that. The first is planning: the transparent grade is a separate product from the ten tinted shades, and Renders World does not stock it, so a specification written this way needs that second material in hand before the sponge work starts. The second is the choice of shade. A worked-back finish shows the render through the thin places, which is why a mid brown suits this method — dark enough to leave a clear grain, light enough that the lifted areas do not go flat.
Coverage, and How Many Packs a Wall Takes
Consumption is given per litre, not per pack: 4–5 m² from one litre at a single coat. The pack holds 4 litres, so 4 L × 4–5 m²/L gives 16–20 m² per coat. The Atlas data sheet adds that exact consumption is settled by a trial on the substrate to be painted.
- Divide the area by 16 m² per pack per coat and round up. A 40 m² elevation takes three packs for a single coat.
- Multiply by the number of coats. One or two layers are both permitted and no second coat is required.
- The aged-plank method needs its own allowance, because the transparent coat is a second pass over the whole area.
Conditions the Sponge Work Depends On
The worked-back method suits a programme with a gap built into it, since the second stage starts only once the first has dried right through. Three conditions govern that timing, and none of them is negotiable.
- Seasoning of the background. Cermit WN at least 3 days; new cement render at least 14 days at 2 % moisture; concrete at least three months under 2 %; gypsum substrates and boards under 2 %. Those periods assume setting at +20 °C and 50 % air humidity, so a cold week buys nothing.
- Weather during the work. Substrate and air between +10 °C and +30 °C, air humidity under 80 %, no strongly sunlit elevation, and protective nets on the scaffold.
- Time between the stages. Drying is roughly 30 minutes and can stretch to two hours; early resistance to rain comes only after some 24 hours, and the sponge stage has to fall comfortably inside that.
Beyond the timing the handling is ordinary. Stir with a slow-speed paint mixer, never thin it and never mix it with anything else. Work along the pressed grain with a brush, roller or sponge and leave no bare recess. Keep one production date to one surface, and wash the tools in clean water afterwards.
Where It Sits in the Method
Atlas Bejca Walnut is the last of four steps, and the other three are on the same shelf.
- Cermit WN mineral render — some 4 mm thick, roughly 2.5–3.0 kg per square metre, 25 kg bags, with the grain pressed in 20 to 60 minutes after laying.
- Silicone wood stamp, 200 × 20 cm — forms the plank.
- Anti-adhesive agent for silicone moulds — the Cermit WN documentation requires the mould greased thoroughly before use, without qualification.
- Our step-by-step guide to decorative effect renders runs the sequence end to end; our guide to sealers for decorative renders covers the shades.
Walnut Against the Other Three Shades
Renders World keeps birch, teak, walnut and ebony of the ten. Since the shades differ in pigment alone — same binder, same consumption, same permitted backgrounds, same pack — the choice is a choice of tone and nothing else, and it is settled on a stamped sample rather than on paper.
- 08 Birch — the palest, for a light timber tone over a darker base render.
- 06 Teak — the warm mid tone, the everyday board colour.
- 03 Walnut — this one, a cooler and deeper brown than teak, and dark enough to leave a clear grain when the sponge lifts the raised areas.
- 09 Ebony — the darkest, and the one the dark-colour caution is aimed at.
Technical Data and the Limits
| Property | Value |
|---|---|
| Density | 1.02 kg/dm³ |
| Consumption | 4–5 m² per litre, one coat |
| Pack | 4 litre bucket |
| Application temperature | +10 °C to +30 °C |
| Air humidity during the work | under 80 % |
| Drying | 30 minutes to two hours |
| Early resistance to rain | after about 24 hours |
| Water absorption, 24 h | 200 g/m² or less, over Cermit WN |
| Relative diffusion resistance | 1.0 m or less |
| Scrub resistance | over 5000 strokes, PN-C/81913 |
| VOC content | under 129.9 g/l, category A/f/FW |
| VOC permitted | 130.0 g/l for that category |
| Storage life | 12 months from the production date on the pack |
| ATLAS ETICS kit | ITB-KOT-2020/1616, issue 3 |
| ATLAS ROKER kit | ITB-KOT-2021/1919, issue 2 |
| ATLAS ROKER EPS kit | ITB-KOT-2020/1188, issue 1 |
Excluded on horizontal surfaces, on surfaces under permanent direct action of water and snow, and where damp rises by capillary action. Four things carry no number in the Atlas documentation and therefore carry none here: a dose in kg/m², a requirement for a second coat, an HBW value for an individual shade, and a service life or repaint interval.
Questions Buyers Ask
- What does the aged-plank method add to the order? A second material. Atlas Bejca Walnut does the colour and the sponge work; the protective pass over it is transparent Bejca, which is not one of the shades stocked here.
- Will Atlas Bejca Walnut look the same on grey render as on white? No. The film is semi-transparent, so the cured shade of the Cermit WN under it is part of the result, and the sample panel is the only honest answer.
- Is walnut technically different from the other three shades? No. Nothing in the Atlas documentation separates the ten on any property but pigment.
- How long will the tone hold? No service life and no repaint interval are published, so there is no figure to quote. UV resistance is stated as a property of the pigments.
Technical Documentation
- ATLAS BEJCA karta techniczna, update date 2023-09-04 (PDF)
- ATLAS BEJCA Technical Data Sheet, English edition, update date 2023-04-05 (PDF)
Atlas Bejca Walnut is the shade to pick for a deeper board tone, and the one to pick when the finish is meant to look worked rather than new. The rest of the method, and the birch, teak and ebony shades beside it, sit together in our range of decorative effect renders.