Description
This tin is one of ten Atlas Bejca shades and one of three Renders World stocks, sitting at the colouring stage of the Atlas wood-effect sequence in the concrete effect render range. The audit below rests only on what Atlas publishes and what the live listing states, which is a shorter specification than this page previously carried — and a different ordering calculation.
Where a Walnut Bejca Coat Belongs on an Atlas Wood-Effect Wall
Atlas Bejca Sealer Walnut 4L is the semi-transparent staining impregnant Atlas specifies over Cermit WN decorative render, covering 4–5 m² per litre per coat and giving a stamped mineral surface the colour of a dark timber board. Atlas states the scope in four parts.
- The documented primary role: a thin, coloured protective coating on Atlas Cermit WN decorative render imitating the texture of natural wood. The stamp forms the grain; this tin colours and protects what the stamp made.
- Named as a system component: Atlas states the product is part of thermal insulation systems, and the distributor listing for this shade names ATLAS ETICS and ATLAS ROKER. That is manufacturer system membership as published — nothing here describes the tin as certified or approved.
- Other backgrounds Atlas allows: concrete, all types of mineral render whether smooth or textured, gypsum render and putty, and gypsum plasterboard, which is why one shade can run from an elevation through to an interior panel.
- Shade 03 in a ten-shade palette: the range runs 01 Alder, 02 Pine, 03 Walnut, 04 Oak, 05 Mahogany, 06 Teak, 07 Rosewood, 08 Birch, 09 Ebony and 10 Acacia, so walnut is a documented position in a family rather than a one-off tint.
Because the pigments are semi-transparent, the cured colour of the render underneath contributes to the finished read. That is the practical reason a walnut specification is settled on a stamped sample rather than on a swatch card, and it is the same reason the trial panel below earns its place in the programme.
What Atlas Publishes About the Coating, and What It Does Not
Atlas describes this product chemically rather than numerically, and each stated property has a consequence on a grooved surface.
- Binder: a mixture of low-molecular polymer dispersions and silicone resins. Atlas credits the high polymer dispersion content with coat elasticity and resistance to weather, so the film flexes with the render panel rather than sitting rigid across the stamp lines.
- Strongly hydrophobic: the added silicone resins reduce water absorption of the coating and reduce the adhesion of dust and dirt particularly in the recesses of the render — which on a wood stamp is precisely where soiling would otherwise gather and flatten the grain.
- Colour stability: specially selected semi-transparent pigments of high UV resistance, supplemented with small additions of inorganic pigments, which Atlas states holds colours stable for years. No figure in years is published by Atlas, and none appears on this page.
- Consumption: 4–5 m² per litre at a single coat, with Atlas adding that the exact value is determined by a trial carried out on the rendered substrate itself.
Several working figures that appeared on the previous version of this page are absent from every source retrieved this session: a density, a drying interval between coats, an application temperature band and a rain-resistance period. Atlas's technical sheet sits on a server that refuses automated retrieval, attempted again this session without success. Those numbers are omitted rather than repeated — the tin and the sheet delivered with the goods carry them, and those are the versions to work to.
Ordering the 4 Litre Tin: What the Coverage Figure Actually Gives You
This is the substantive change from the previous page. Renders World lists the tin at £69.00, in stock, August 2026, and the sourced consumption produces a tighter coverage than was previously published.
| Calculation | Operands and result |
|---|---|
| Coverage per tin, one coat | 4 L × 4–5 m²/L = 16–20 m² |
| Material cost per m², one coat | £69.00 ÷ 16–20 m² = £3.45–£4.31/m² |
| Coverage per tin, if two coats are specified | 16–20 m² ÷ 2 = 8–10 m² of finished facade |
| Tins for a 40 m² elevation, one coat | 40 ÷ 16–20 = 2.0–2.5, rounded up = 3 tins |
| Previously published figure | 26–40 m² per tin — no source found this session; omitted |
Order against the lower band of 16 m². The gap between the two figures is close to double, and a facade quoted on the higher one would run short before the last panel. Atlas resolves this properly rather than approximately: a stamped trial panel, coated and measured, turns the range into a figure for your own render porosity and stamp depth. The number of coats is a finish decision that no source retrieved this session fixes, so it belongs in the same trial.
Applying Walnut Bejca Over Cured Cermit WN
The sequence across the Atlas timber system runs render, release agent, stamp, then colour — the full method sits in the concrete effect render application guide, and the comparative view across the shades is in the guide to sealers for concrete effect renders. Three points belong specifically to this tin.
- Coat the trial panel and keep it. Atlas ties exact consumption to a substrate trial, so the panel does two jobs at once: it fixes the tin count and it settles the shade against the base render before the client signs anything off.
- Keep the pigment in suspension. Semi-transparent pigment systems settle in the tin, so a periodic re-stir keeps the last panel matching the first. That is ordinary trade practice with tinted coatings rather than a manufacturer instruction, and it is offered here as such.
- Preparation of anything other than fresh Cermit WN belongs upstream. Where the background is concrete or an existing mineral render, the priming stage is chosen for that background, and Renders World holds it in the exterior render primers range.
Working conditions — the temperature band, the recoat interval and how long the fresh film needs before rain — are exactly the figures this session could not source from Atlas. Read them off the tin before the first coat, and the day plans itself around them without guesswork.
Walnut Against the Other Two Shades Stocked
Three of the ten Atlas shades are stocked here. No source retrieved this session separates them on any technical property — same binder, same consumption, same permitted backgrounds, same tin size and same price. The decision is tonal, and it is made against the manufacturer's swatch and the colour of the render beneath.
| Shade | Position in the Atlas palette | How the choice is made |
|---|---|---|
| 03 Walnut, this tin | The darkest of the three stocked, six positions above ebony | Chosen where contrast against pale render or masonry is the design point |
| 06 Teak, the warm mid-tone | Mid-palette, between mahogany and rosewood | The default warm timber-board read across a full elevation |
| 08 Birch, the palest | The lightest of the three stocked | Chosen for a pale Nordic read, typically over lighter base render |
Specifying Walnut Bejca: A Four-Point Check
- Confirm the background is one Atlas names. Cermit WN for the timber effect, or concrete, mineral render, gypsum render, putty and plasterboard for flat work.
- Trial the shade and the consumption together. One stamped panel answers both questions, and Atlas asks for it on the consumption side anyway.
- Order to 16 m² per tin per coat. Multiply by the number of coats the finish needs and hold a spare tin against higher absorption.
- Take the working figures off the packaging. Temperature limits, recoat interval and rain resistance ship with the goods.
Where the brief moves away from timber altogether, the smooth and brick-effect routes sit alongside this one in the concrete effect render collection, and Renders World stocks Atlas Base Coat Paint 10 L as the tinted base for that side of the range. Atlas does not name it within the Bejca scope, so confirm the pairing when the order is placed.
FAQ — Coverage, Backgrounds and Shade Choice
How many tins does an elevation take?
Divide the area by 16–20 m² per tin per coat, round up, then multiply by the number of coats specified. A 40 m² gable takes three tins for a single coat. Atlas asks for a trial on the actual rendered substrate to firm that up, because stamp depth and render porosity move consumption within the band.
Which backgrounds does Atlas allow?
Cermit WN decorative render is the documented primary background. Atlas additionally names concrete, all types of mineral render whether smooth or textured, gypsum render and putty, and gypsum plasterboard, which is what lets a single shade carry from an external elevation to an interior feature panel.
Does it belong on an insulated wall build-up?
Atlas states the product is part of thermal insulation systems, and the listing for this shade names ATLAS ETICS and ATLAS ROKER. That is system membership as the manufacturer publishes it. No certificate covering this tin was retrieved this session, so nothing here calls it certified.
Is walnut technically different from the teak or birch tin?
No source retrieved separates the shades on anything but colour — binder, consumption and permitted backgrounds read identically across all three. Treat it as a tonal decision and settle it on a stamped sample, where the base render shows through the semi-transparent film and changes how dark the walnut actually reads.
Does a dark shade behave differently on the wall?
Atlas publishes no separate data for darker shades, so no performance difference is claimed here. What the manufacturer does state applies equally across the palette: UV-resistant pigments for colour stability and a hydrophobic silicone-resin film that keeps dirt from settling in the stamp recesses, which is the property doing the most visible work on a dark finish.
How is the finish maintained?
Atlas states colour stability over years without publishing an interval, so no service life in years appears on this page. In practice the surface is maintained like any coated facade, with periodic low-pressure washing — and the silicone content is already reducing how much deposit collects in the grooves between washes.
Technical Documentation
Retrieved this session:
- ATLAS BEJCA product page, Atlas English site — scope of use and permitted substrates.
The full Atlas technical sheet is hosted on a server that refuses automated retrieval; it ships with the goods and carries the working figures omitted above.