plaster sand
NO NO !! You must remove the vinyl completely and then check what substrate you have. Concrete plaster or brick will be fine.
Masonry nails have very small heads, and are notoriously difficult to remove from plaster, concrete, and wooden walls. The best way to remove them, without removing the plaster, is to cut the head off so that it is flat to the wall. Then, fill in the hole and repaint, if necessary.
To get your plaster cast removed, you need to visit your healthcare provider. They will use a specialized saw to cut through the plaster without touching your skin. It is important to never try to remove the cast yourself as it could result in injury.
ehm wet the plaster
BRICK PLASTER AND GLASS
After removal of plaster there is swelling prescribe gtreatment please
Vinegar removes lime from brick.
Use a roundup to kill the moss, after it is dead pressure wash it off.
You need a clean sharp washed riversand cement and lime.
The materials were Ashlar (dressed stone) and brick
If you mix a bit of epoxy with the plaster and work quickly you will have a greater chance of it lasting.