Keim is the German silicate-paint manufacturer that, since Adolf Wilhelm Keim's 1878 patent, has held the technical authority on mineral coatings for masonry and lime substrates. The brand sits adjacent to flooring rather than inside it — Keim's category is wall, façade, and restoration paint — but the chemistry overlaps with microcement primers, limewash continuity, and the heritage-finish design vocabulary that microcement borrows. A FloorDSGN specifier should know Keim because the brand is the wall-and-façade partner most often paired with serious decorative floor work in IL.
What makes silicate paint different from acrylic
Acrylic paint forms a film on top of the substrate; adhesion is mechanical (interlocking with surface roughness) plus weak chemical bonds. Silicate paint chemically reacts with mineral substrates to form a permanent bond — the silicate condenses into the calcium and silica content of the substrate, becoming part of the wall rather than a layer on it. The technical term is silicification. The result is a paint that cannot peel because it has no separate layer to peel — it has chemically married the substrate.
This matters in two flooring-adjacent contexts. First, in heritage restoration where the substrate is lime mortar or natural stone, only silicate paint maintains the chemical compatibility with the original material. Second, in modern decorative-concrete and microcement projects where the wall is part of the visual continuity with the floor — silicate paint allows the wall to share the breathing, weathering, and visual character of the cementitious floor without behaving like an alien acrylic film.
The product range relevant to FloorDSGN work
- Keim Royalan
- Interior silicate paint for walls and ceilings. The standard SKU for interior decorative work paired with microcement floors. Available in extensive RAL and Keim's own mineral colour palette. Matt finish, fully mineral, vapour-permeable.
- Keim Granital
- Exterior silicate paint for façades. Reference SKU for heritage restoration and modern mineral façade work. 15–30 year service life on properly prepared masonry.
- Keim Optil
- Interior silicate paint with hybrid acrylic-silicate chemistry for substrates that cannot meet Royalan's pure-mineral substrate requirements. Used where existing acrylic paint cannot be fully removed.
- Keim Soldalit
- Exterior sol-silicate paint with broader substrate tolerance than Granital. Used on mixed-substrate façades and modern construction.
- Keim Concretal-W
- Silicate paint engineered specifically for concrete substrates — the direct match for decorative-concrete and microcement wall work. UV-stable, vapour-permeable, mineralises into the cement matrix.
- Keim Restauro
- Heritage restoration line for limewash, fresco, and historical masonry. Used by museum and listed-building conservators. Niche but worth knowing for IL heritage projects (e.g. old Jerusalem, Old Yafo, Tel Aviv Bauhaus White City).
Where Keim fits in a Floor.DSGN specification
A typical FloorDSGN project specifies microcement or polished concrete on the floor. The wall is most often left to a separate trade — acrylic paint by a contractor, tile by a tiler, plaster by a plasterer. The visual coherence between floor and wall is then negotiated case-by-case, often poorly.
Specifying Keim on the wall as the deliberate pair to a cementitious or microcement floor closes the visual coherence problem at the material level:
- Vapour permeability matches. Microcement breathes mildly; Keim breathes fully. Acrylic paint on the wall against vapour-permeable microcement traps moisture at the floor-wall junction, producing efflorescence and peel. Keim does not.
- Pigment palette overlap. Keim's mineral pigments are the same lime-fast oxides used in Marmorino, Tadelakt, and Mortex pigment systems. The wall and the floor can match precisely on the same earth-tone hex.
- Heritage credential. For Bauhaus / old-Tel-Aviv / Templer / Yemenite-Tel-Aviv restoration projects, Keim is one of the few brands with credibility at the conservation-officer level.
- Service life parity. Microcement floor service life with sealer renewal is 10–15 years; Keim wall paint is 15–30 years. The pair holds together without re-paint cycles disrupting the floor.
Where Keim is wrong
- Floor itself. Keim does not make floor finishes. Specifying Keim on a floor is a category error.
- Existing acrylic substrates. Keim Royalan / Granital need mineral substrates to silicify with. Existing acrylic paint must be fully removed (mechanical, not chemical), which is expensive and rarely budget-approved on retrofits. Use Optil hybrid for these cases — less ideal but functional.
- Price. 2–4× the price of equivalent acrylic paint at the line item. The premium pays back over 15+ year service life but requires upfront budget acceptance.
IL channel and use cases
Keim's IL channel goes through specialty heritage-restoration importers. The brand is not at consumer paint-store shelf level — specification requires a project-specific quote. Reference IL projects: Tel Aviv Bauhaus restoration district (multiple buildings under municipal conservation), Old Yafo restoration, Mount Scopus campus heritage maintenance.
For modern FloorDSGN projects: Keim becomes relevant when the project wants visual coherence between cementitious floor and wall paint. In standard residential where the wall paint is conventional acrylic, Keim is over-specified. For luxury residential, hospitality, museum, gallery, and conservation work — Keim is the answer when the architect cares about material coherence at this level.
Final read
Keim is the right specification for the wall side of any FloorDSGN project where vapour-permeable mineral substrate coherence matters or where heritage credential is required. It is over-specified for standard residential work where wall paint is decoupled from floor finish. As an owner-named partner brand, Keim is worth offering on projects where the client asks for "mineral wall paint" or "breathing wall" — the brand closes that conversation faster than competitor mineral paints.
Related: Microcement 7-way comparison · Microcement binder chemistry · Mortex brand.
Sources
- Keim Group corporate
- Keim Royalan interior silicate paint
- Keim Granital exterior silicate paint
- EN 1062-1 — Paints and varnishes for exterior masonry and concrete classification (silicate paint sub-class).
- Adolf Wilhelm Keim, 1878 — Mineral Painting (patent and technical treatise).