Description
Atlas Bejca ebony is colour 09 of Atlas's semi-transparent render stain, made for Atlas Cermit WN wood-texture render. A 4 litre bucket arrives ready to use and covers about 16 to 20 m² a layer; you put it on with a brush, roller or sponge, following the pressed grain. Use it on a dry wall when wall and air sit between +10 °C and +30 °C and relative humidity is under 80 %.
What Atlas Bejca ebony is for
Atlas Bejca ebony gives Cermit WN its 09 Ebony colour as a thin protective coat over the pressed planks. The maker also lists these surfaces:
- concrete;
- smooth and textured mineral renders;
- gypsum plasters and fillers;
- plasterboard.
The Atlas Bejca feature list also mentions the possibility of an aged-wood effect.
Four reasons to choose it
- Atlas specifies Atlas Bejca over Cermit WN, so the render and the stain work as a pair.
- Atlas Bejca's silicone resins give strong water repellence and cut the dust and dirt that stick, especially in the recesses of the grain. On Cermit WN it takes up 200 g/m² of water or less in 24 hours.
- Relative diffusion resistance is 1.0 m or less; the lower the figure, the more easily moisture vapour passes through the coat.
- The pigments are semi-transparent and selected for high UV resistance, with small additions of inorganic pigment.
What one bucket covers
The maker states 4 to 5 m² per litre for one application, so a 4 litre bucket of Atlas Bejca ebony covers about 16 to 20 m² a layer. A trial on the surface to be painted fixes the exact consumption for your wall.
Two practical points when you order:
- One or two layers are permitted; count the area per layer.
- For a large wall, buy all the buckets together and look at the production date on each, because Atlas wants one production date on a single surface.
Sun, protection and the render beneath
- Atlas says not to use Atlas Bejca ebony on strongly sunlit parts of the facade.
- Keep the face out of direct sun before the work and for about 24 hours after it, and hang protective nets on the scaffold.
- Until the stain has dried through, protect the wall from dust and rain.
The warning about HBW below 20 concerns the colour of the render under the stain. The maker recommends deep, intense render colours of that kind for limited areas of a facade, because they absorb more solar radiation. For more on dark colours and heat, see our guide to dark colours on render and solar heat in the UK.
Putting it on
- Mix Atlas Bejca ebony thoroughly with a slow-speed paint mixer before use, and again while you work if needed. Nothing else may be added to it.
- Apply with brush, roller or sponge along the grain of the pressed plank.
- Lay one even, thin film, with no runs or bare spots and every recess of the grain covered.
- Spraying is allowed; mask the adjoining facade, windows and doors well.
- Allow 30 minutes to 2 hours to dry, depending on the surface, temperature and humidity.
- Rinse the tools in clean water straight after use.
Horizontal surfaces, surfaces under permanent direct water or snow, and walls that draw damp up by capillary action are outside what the maker intends it for.
What goes with it
The method behind a timber-grain facade has four steps, and Renders World stocks each of them in its wood-effect render collection:
- Atlas Cermit WN, the render that holds the grain;
- the Atlas silicone wood stamp, which presses the plank pattern in;
- the Atlas release agent, which lets the stamp lift cleanly;
- Atlas Bejca ebony, which colours the result.
The Renders World cancellations and returns page has the terms before you order.
Four colours on the shelf
Atlas makes ten colours of this stain, and four of them are on the Renders World shelf.
| Colour | Bucket |
|---|---|
| 03 Walnut | 4 litre bucket |
| 06 Teak | 4 litre bucket; the Atlas sheet names it 06 tekwood |
| 08 Birch | 4 litre bucket |
| 09 Ebony | 4 litre bucket |
The figures and the method here are the same for all four colours of Atlas Bejca; only the colour changes. Stain a patch of each candidate on cured Cermit WN and compare them on the wall itself.
Technical data and compatible surfaces
| Property | Value |
|---|---|
| Colour | 09 Ebony |
| Pack | 4 litre bucket |
| Coverage | 4 to 5 m² per litre per application |
| Binder | Polymer dispersions and silicone resins |
| Density | 1.02 kg/dm³ |
| Application temperature | +10 °C to +30 °C, wall and air |
| Humidity during work | Relative humidity under 80 % |
| Drying | About 30 minutes, up to 2 hours |
| Early rain resistance | After about 24 hours |
| Water absorption, 24 hours | 200 g/m² or less, on Cermit WN |
| Scrub resistance | More than 5000 cycles, PN-C/81913 |
| Diffusion resistance | Relative, 1.0 m or less |
| VOC content | Category A/f/FW, under 129.9 g/l (limit 130.0) |
| Shelf life | 12 months from the date on the pack |
Atlas lists the coating as a component of its ATLAS ETICS, ATLAS ROKER and ATLAS ROKER EPS insulation kits. Their assessments (ITB-KOT-2020/1616, ITB-KOT-2021/1919 and ITB-KOT-2020/1188) are Polish national ones, not UK approvals.
| Surface | Fit and waiting time |
|---|---|
| Atlas Cermit WN render | The render it is made for; at least 3 days of seasoning |
| New cement and cement-lime renders | Suitable after at least 14 days, moisture 2 % |
| Concrete walls | Suitable after at least 3 months, moisture under 2 % |
| Gypsum substrates, plasterboard, fibre-cement boards | Suitable with moisture under 2 % |
| Smooth and textured mineral renders | Suitable as a base for the stain |
| Horizontal surfaces, permanent water or snow, rising damp | Excluded by Atlas |
The seasoning times assume setting at +20 °C and 50 % air humidity.
Questions about Atlas Bejca ebony
Does it have to go on Cermit WN?
No. Atlas makes it for Cermit WN and lists concrete, mineral renders, gypsum plasters and plasterboard as well. Cermit WN needs at least 3 days of seasoning first, new cement renders at least 14 days and concrete at least 3 months.
How far does a 4 litre bucket go?
About 16 to 20 m² a layer, based on the maker's 4 to 5 m² a litre. Test on your own wall to confirm.
What should I do about sun on the wall?
Skip the strongly sunlit parts, keep direct sun off the face before the work and for about 24 hours after, and use protective nets on the scaffold.
Can I buy the buckets for one wall at different times?
Atlas asks for a single production date on any one surface, so order together and compare the dates on the packs.
One layer or two?
Atlas permits either. Whichever you choose, each layer should be a thin, even film with every recess of the grain covered.