An old apartment, where dry wall was a thing yet. The ceiling is concrete, plastered and painted.
There are many holes, from current and previous owners (different light spots installed in different locations).
There is a concern now about just masking these holes with compound and painting. When another person decides to drill new holes to install new lights (or even a projector), it might be too close to an old hole that was masked with compound, and that could cause it to fall. Drilling right by a compound would not give the same grip, and things would fall.
Maybe I wrote too much, but the question is: if masking with compound and paint is not acceptable enough, what would be the way(s) to repair this ceiling so it is like the original, allowing new holes that would be safe as an original ceiling (without the fear of being too close to a masked hole)?
This should be valid for a wall of the same material (not dry wall, that is, a concrete+plaster+paint). Drilling right be a repaired hole with compound might be unsafe if hanging heavy items like a TV.
I know the odds are low, but it can happen if there are many holes.
Thanks!
Best Answer
Use a resin or hard setting product and make sure the holes are dust free.
Worked well for me, either reusing those holes or having to drill a new hole part through the wall of the repair.