Replacing a kitchen - behind it is old cement and plaster. I want a smooth surface, especially since the far part will become a bedroom - see picture. What do you think about first chiseling away what's sticking out with a chisel or by hand, alternatively grinding down with an angle grinder and diamond grinding cup or cup wheel. But after that? What do I fill and level with? Plaster mortar or something else? Grateful for advice!
On a package of plaster mortar I found on the web, it says:
"If you are plastering an existing surface, you must know what mortar it was plastered with before, and which mortar works with it. It is very important that the mortar you use is not stronger/harder than the old one. In a dry and warm indoor climate, it is also necessary to pre-water the substrate for better adhesion. If you are plastering on an absorbent substrate, this should be slurried, which you do by softening the mortar in water until it gets a porridge-like consistency and then spreading it over the substrate in a 2-3 millimeter thick layer. When this layer begins to lighten, it is time to apply the plaster."
Other parts of the wall look smooth, chisel off what is on top, take a straight board and drag it over the wall so you see where to chisel off, a sander is not good as it dusts down the whole house. Then moisten the wall with a spray bottle so it gets nicely wet, wait until it is almost dry and fill with a regular cheap wall filler, sand and fill again until it is an even and smooth surface.
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