The house is from -37, so it is most likely plastered with a lime mortar originally, and most likely a hydraulic lime mortar. If it was replastered at a later time, a KC mortar, which became common in the mid-20th century, might have been used.
Husfix is a pure cement product, and applying this to the walls, which, as visible in the pictures, have moisture at least at the bottom near the floor and on a lime mortar, will only lead to it falling off after a while because it becomes too dense and the underlying plaster will release.
Use a hydraulic lime mortar or at least a KC mortar instead to have a better chance of it staying in place.
Yes, just dampen the holes with a little water, insert or tap in the lime mortar, and after a few minutes, smooth the surface with a piece of wood so that it matches the pattern of the rest of the wall.
Walks and walks...
Three times the grain size is usually normal, i.e. about 10 mm for a coarse mortar. You should make several applications.
And you must chip and brush away what is loose, and the paint must also be removed.
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