Description
Atlas Bejca walnut, colour 03, is a semi-transparent render stain from Atlas, ready to use from the bucket and made to colour Cermit WN wood-texture render. One 4 litre bucket does about 16 to 20 m² of a single layer. Atlas sets the working window at +10 °C to +30 °C for wall and air, with relative humidity under 80 %.
Atlas Bejca walnut at a glance
Atlas Bejca walnut is a thin, coloured, protective coating for Cermit WN decorative render, whose pressed surface imitates the texture of natural wood. Atlas Bejca is listed for these surfaces:
- Cermit WN decorative render, the surface it is made for
- concrete
- mineral renders, smooth or textured
- gypsum plasters and fillers
- plasterboard
Five reasons to pick walnut
- It was developed for Cermit WN, so the base and the stain on top come from the same maker as one job.
- It dries in about 30 minutes to 2 hours, and early rain resistance arrives after about 24 hours.
- It withstands more than 5000 scrub cycles to PN-C/81913.
- Added silicone resins make it strongly hydrophobic: water runs off rather than soaks in, and less dust and dirt clings, particularly in the recesses of the surface.
- On Cermit WN, Atlas Bejca absorbs 200 g/m² of water or less in 24 hours, and its relative diffusion resistance is no more than 1.0 m. A lower diffusion figure means moisture vapour leaves the wall more easily.
Coverage per bucket
Per litre, Atlas states 4 to 5 m² for one application. A bucket of Atlas Bejca walnut is therefore good for about 16 to 20 m² of a single layer. The real consumption is fixed by a trial on the wall you are going to paint, so do that before you size the order.
- The maker permits one or two layers; count the area once per layer you plan.
- For a wall that takes several buckets, buy them together. Atlas wants coating from one production date on a given surface to avoid differences in shade, and the date is printed on the pack.
Conditions on the day
| Condition | What Atlas asks for |
|---|---|
| The wall | Dry, sound and free of contamination |
| Temperature | +10 °C to +30 °C, both wall and air |
| Air humidity | Relative humidity under 80 % during the work |
| Direct sun | Not on strongly sunlit parts of the facade |
| Sun before and after | Shade the painted face before and for about 24 hours after |
| Scaffolding | Protective nets on the scaffold |
The maker rules out flat horizontal surfaces, places under constant water or snow, and walls that draw damp up by capillary action. Deep, intense colours of the Cermit WN beneath (HBW below 20) are recommended for limited areas of a facade, as they absorb more solar radiation; that concerns the base, not the stain.
Grain, pigment and the aged wood effect
Among the features Atlas lists for Atlas Bejca is the possibility of an aged wood effect. On Cermit WN the walnut goes on along the pressed grain of the plank. The pigments are semi-transparent ones selected for high UV resistance, topped up with a little inorganic pigment.
- Work in one even, thin layer, free of runs.
- Leave no missed patches; Atlas does not allow uncoated spots.
- Take the walnut into every recess of the grain.
Mixing, applying and cleaning up
- Atlas Bejca is supplied ready to use, and nothing else should be mixed into it. Stir it well with a slow-speed paint mixer, and once more during the work when needed.
- Apply with a brush, a roller or a sponge. Spraying is allowed if the adjoining facade, windows and doors are carefully covered.
- Until the stain has dried right through, protect the face from dust and rain.
- Wash the tools in clean water as soon as you finish.
Companions for the job
Atlas Bejca walnut finishes a method that also needs the render, the stamp and the release agent, all listed by Renders World in the wood-effect render collection. They are:
- Atlas Cermit WN takes the grain;
- the Atlas silicone wood stamp presses it in;
- the Atlas release agent keeps the stamp from sticking.
For the stain itself, bring a brush, roller or sponge and a slow-speed paint mixer. The Renders World cancellations and returns page has the order terms.
The colours around 03 Walnut
Of the ten colours Atlas makes, Renders World lists four. Each sits in its own 4 litre bucket and each is the same Atlas Bejca underneath, so the figures and method above apply to all of them.
| Colour | Bucket |
|---|---|
| 03 Walnut | 4 litre bucket; the colour you are reading about |
| 06 Teak | 4 litre bucket; the Atlas sheet names it 06 tekwood |
| 08 Birch | 4 litre bucket |
| 09 Ebony | 4 litre bucket |
Stain a small patch of cured Cermit WN in the colours you are weighing up and compare them on the wall itself.
Specification and where it fits
| Property | Value |
|---|---|
| Colour | 03 Walnut |
| Pack | 4 litre bucket |
| Binder | Polymer dispersions and silicone resins |
| Yield | 4 to 5 m² per litre, one application |
| Density | 1.02 kg/dm³ |
| Drying time | About 30 minutes, up to 2 hours |
| Early rain resistance | After about 24 hours |
| Scrub resistance | More than 5000 cycles, PN-C/81913 |
| Water absorption, 24 hours | 200 g/m² or less, on Cermit WN |
| 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 Bejca is a component of the ATLAS ETICS, ATLAS ROKER and ATLAS ROKER EPS insulation systems. Those systems carry Polish national assessments (ITB-KOT-2020/1616, ITB-KOT-2021/1919 and ITB-KOT-2020/1188), not UK approvals.
| Where it goes | Before you start |
|---|---|
| Atlas Cermit WN render | Season for at least 3 days |
| Concrete walls | At least 3 months, moisture under 2 % |
| New cement and cement-lime renders | At least 14 days, moisture 2 % |
| Gypsum substrates, plasterboard, fibre-cement boards | Moisture under 2 % |
| Smooth and textured mineral renders | Suitable as a base for the stain |
Those times hold for setting at +20 °C and 50 % air humidity.
Questions about Atlas Bejca walnut
What weather does it need?
Wall and air between +10 °C and +30 °C, relative humidity under 80 %, and no strong sun on the face. Put nets on the scaffold and keep the face shaded for about 24 hours afterwards.
Will buckets bought separately match?
Aim for buckets from one production date on any single surface, because Atlas gives that as the way to avoid differences in shade. The date is on the pack.
How soon can rain reach it?
Early rain resistance arrives after about 24 hours. Until the walnut has dried right through, keep dust and rain off the face.
How long does a bucket keep?
Atlas gives 12 months from the production date printed on the pack.
Can it go on concrete or plasterboard?
Yes. Concrete needs at least 3 months and moisture under 2 %; gypsum substrates and plasterboard need moisture under 2 %.