English translation: coat of mineral [based] paint
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I think that this is nothing but a very simple coat of mineral-based paint to be applied to the interior (plaster) surfaces of the stair case.
Dri-White, weißer mineralischer Anstrich für Mauerwerk - wasserabweisend, kein abblättern. ...
A search on "mineral paint" brought up a lot of sites originating in German-speaking countries which leads me to believe that the mineral base of the paiint must be of greater importance to Europeans. For instance:
After curing and drying the surface was finished with a white coat of mineral base paint. ... www.wiedemann-gmbh.com/english/sogewoelbekeller.html
Mineral paint , a pigment made chiefly of some natural mineral substance, as red or yellow iron ocher. --
Anstrich m / coat of paint
Anstrich m, Anstreicherarbeit f / house-painting, painter's work
Anstrich m, Tünche f / whitewash, limework
Explanation: Check out the extracts from web sites:
Kaubit Polymer Finish Coat
Coloured, solvent-free UV protection coating for mineral surfaces in
Kaubit Polymer Finish Coat is a solvent-free, high-quality acrylate dispersion containing weather-resistant pigments, selected fillers and special additives. When delivered Kaubit Polymer Finish Coat is ready-to-use and can be applied using a roller, surface spreader, wide paint brush or suitable spraying device.
MASTERTOP PRIMER 2 is a high grade, low-viscosity, solvent-free, two component epoxy resin coating for mineral surfaces. MASTERTOP PRIMER 2 is used as a sealer or a filler with and without the addition of quartz sand.