Description
A deep facade colour needs a paint that holds its shade in sun and rain and still lets the wall breathe. The Atlas Salta silicone masonry paint base grey 10L is the bucket Renders World tints for mid-tone and deep shades of the SAH palette, charcoal included, and it belongs to the silicone masonry paint range beside its white twin.
Atlas Salta Silicone Masonry Paint Base Grey 10L for Deep Shades
Salta is one paint sold on a white and a grey tinting base. Atlas makes it on a selected polymer dispersion with high-grade fillers and pigments. The maker declares one set of properties for the paint, not one per base:
- Colour that lasts: latest-generation pigments give high UV resistance and long colour durability on the facade, which is what a dark shade asks of a paint first.
- A film that sheds dirt: dense and smooth, so settling dirt and fungal spores lose contact and leave with rain and wind; the coating is not prone to algae growth.
- A wall that breathes: the microporous film lets water vapour pass through the painted wall.
No separate primer is needed, because the first coat primes the substrate, and fresh mineral thin-coat render can be painted five days after it was laid.
The palette runs to 418 colours of the SAH render and paint colour system. Whites, creams and light shades are tinted on the Atlas Salta white base; mid-tones and deep colours on this grey one. The SAH code decides which of the two to order, and the shop tints either.
Choosing a Deep SAH Shade for an Insulated Wall
Every SAH code in the Atlas colour chart carries a light reflectance coefficient, HBW: the share of light the finished facade throws back. The higher the figure, the less heat the wall takes in.
- Palest SAH codes: HBW up to 86%.
- Near-black greys: HBW 6 to 9%, for example SAH 0446 at 6% and SAH 0434 at 9%.
- Guidance line for insulated walls: HBW 20%.
That number matters on external wall insulation. Atlas's colour chart advises avoiding dark render colours with an HBW below 20% on insulated facades and keeping them to no more than a tenth of the facade. The advice is written for renders; the Salta sheet sets no colour limit of its own. On an insulated wall, checking the HBW of the chosen code before it is tinted takes a minute, and a charcoal on a plinth band or window reveals stays inside the one-tenth guidance where a whole elevation would not. How orientation and sun change that choice is covered in the guide to light reflectance value render.
Atlas also warns that colours on a screen differ from the real finish, so a shade is confirmed against the printed SAH chart, with the texture of the wall and the light it gets in mind.
Where Atlas Marks Salta as the Right Paint
The Salta sheet marks with a plus where this paint is the answer, and elsewhere names a different paint of the Salta range, which Renders World does not stock.
- Marked suitable: EPS and mineral-wool insulated facades, solid single-leaf walls, soffits, concrete, the reinforced base coat of the named insulation systems, sand-and-cement and cement-lime render, silicone and silicate-silicone thin-coat render, brick, block and aerated concrete, and an existing coat of silicone facade paint.
- Another Salta recommended: mineral, silicate and acrylic thin-coat render; lime and renovation render; gypsum plaster, skim, plasterboard and OSB; silicate and acrylic paint coats; interior walls; historic buildings; walls close to trees, wetlands or open water.
The same sheet clears fresh mineral thin-coat render for painting after five days, yet names a different Salta as its first choice on mineral thin coats. For a deep colour over silicone thin-coat render, concrete or sand-and-cement, Salta itself is the marked choice.
Atlas Salta Technical Data
| Property | Declared value |
|---|---|
| Colours | 418 in the SAH system, 8 of them whites |
| Gloss · coating thickness · grain | G3 matt · E3, 100 to 200 µm · S1, under 100 µm |
| Water vapour transmission | V2, medium, 15 to 150 g/m²·d |
| Diffusion resistance Sd, one coat | 0.14 m to 1.4 m |
| Water permeability | W3, low, under 0.1 kg/m²·h⁰·⁵ |
| Hiding power | Class 2, yield 8 m² |
| Adhesion, PN-80/C-81531 | Degree 1 |
| Density · acidity | 1.42 g/cm³ · pH 8 |
| Working conditions | +5 °C to +30 °C, relative humidity under 80% |
| Drying · next coat | 2 to 6 h · after about 6 h (20 °C, 50% RH) |
| Volatile organic compounds | Category A/c/FW, at most 39.9 g/l against a limit of 40 g/l |
| Pack · shelf life | 10 l plastic bucket · 12 months from the production date |
Drying time depends on the substrate, the temperature and the air humidity. A full bucket holds about 14 to 15 kg of paint: the technical sheet gives a density of 1.42 g/cm³, the safety data sheet 1.5. Salta is also a named finish in Atlas's insulation systems, among them those under ETA-06/0081 and ETA-06/0173; those assessments cover the whole build-up, not the paint alone.
How to Apply Salta and Keep a Deep Colour Even
A dark shade shows every difference in the wall under it, so preparation carries more weight here than on a white. The wall is dry, sound and load-bearing, free of dust, dirt, wax and grease. Weak old paint comes off, and a repair mortar such as Atlas ZW 330 fills small damage and cracks, so the new colour sits on a sound, even surface. Algae, grime or cement splashes go first with a cement remover for renders or a mould remover from the same range. Priming is not required.
- Let new render cure: 5 days on mineral thin-coat render, 7 days on dispersion thin-coat render, 2 to 4 weeks on traditional render.
- Thin only the first coat: stir with a slow-speed paddle, mix in nothing else, and add 5% clean water, 0.5 l per 10 l bucket, keeping that ratio over the whole wall. The final coat, and every sprayed coat, goes on undiluted.
- Apply thin and continuous: by roller, brush or spray (Atlas gives a Wagner HC 950 with a 517 tip at 150 to 170 bar), once or twice depending on how absorbent and textured the wall is, with breaks planned at corners, under downpipes and where colours meet.
Evenness on a deep shade comes down to three things Atlas names. Colour uniformity depends largely on how dry the background is, so old render gets at least 48 hours after rain. One surface takes paint of one production date, so the buckets for a wall are ordered together. And faces of different texture can look like different shades, since the paint slightly smooths the render beneath it. On fresh render the scaffold stays netted from the first day of rendering until 24 hours after painting ends, the finish is kept from hard sun, wind and rain while it dries, and nothing is painted below +5 °C. In poor weather a third coat may be needed to even the surface. Skipping these steps is what brings patchy colour and salt stains on a rendered wall; the full sequence is in the silicone paint application guide.
How Many Buckets a Dark Elevation Takes
Atlas gives consumption per coat by render type and asks for a trial patch to settle it. On one 10 l bucket:
- Mineral thin-coat render: about 0.25 l/m², so 10 ÷ 0.25 = about 40 m² per coat.
- Dispersion thin-coat render: about 0.22 l/m², so 10 ÷ 0.22 = about 45 m² per coat.
- Smooth render: about 0.15 l/m², so 10 ÷ 0.15 = about 66 m² per coat.
The sheet's yield column promises more, 5.0 m² per litre on dispersion render and 7 to 8 m² on smooth render, than its own consumption figures allow. Order on consumption. With a deep colour a shortfall does more harm than a spare bucket: a top-up from a later production date is the likeliest source of a visible band.
Storage and Safety
- Storage: tightly closed buckets in a cool, dry, ventilated place between +5 °C and +30 °C.
- Shelf life: 12 months from the production date on the bucket.
- Settling: normal in storage and protects the paint from drying out; mix it back by machine before use.
The safety data sheet classifies Salta as Skin Sens. 1A (H317), STOT RE 2 (H373) and Aquatic Chronic 3 (H412).
Ordering the Grey Base
Renders World tints the Atlas Salta silicone masonry paint base grey 10L to the SAH code in the shop as orders come in, so tinting adds no lead time of its own, and orders are processed the same day when the base is in stock. Still weighing silicone against acrylic? The silicone or acrylic masonry paint comparison sets the two side by side.
- Delivery: quoted by the team after the order; parcels up to 25 kg go next day, pallets next day or in two business days on the economy option, always kerbside.
- Collection: from the counter at Unit 9A, Central Trading Estate, Southampton SO14 5JP, Monday to Friday 7am to 5pm and Saturday 7am to 12pm, telephone 023 8200 2442.
- Returns: an untinted bucket bought directly from Renders World can go back within 14 days in original condition; tinted paint is outside that return, which is one more reason to settle the code on the printed chart first.
FAQ
Grey base or white base?
Grey for mid-tone and deep colours, white for whites, creams and light shades. It is the same paint with the same properties; the SAH code decides the base.
Can a charcoal go on an insulated facade?
Atlas's colour chart advises against render colours below HBW 20% on external wall insulation and caps them at a tenth of the facade. The near-black greys sit at 6 to 9%, so on an insulated wall they suit bands and details better than whole elevations.
Does Atlas Salta need a primer?
No. The first coat primes the substrate, and Atlas states that priming is not required for the Atlas Salta silicone masonry paint base grey 10L. The wall still has to be dry, sound and clean.
How many buckets for a dark wall?
About 40 m² per coat on mineral thin-coat render and 45 m² on dispersion render per 10 l bucket, confirmed by a trial patch. Order the whole wall at once, so every bucket shares a production date.
How heavy is a 10 litre bucket?
About 14 to 15 kg of paint: 1.42 g/cm³ on the technical sheet, 1.5 on the safety data sheet.
Technical Documentation
- Atlas Salta — Karta Techniczna, updated 3 November 2025 (PDF, Polish) — the technical data sheet in force.
- Atlas Salta — Karta Charakterystyki, version 9.1 (PDF, Polish) — the safety data sheet.
- Atlas colour chart — SAH colours with HBW per code — the manufacturer's online chart.