LOL ...
Dry lining is plasterboard. Milligan .
I wonder if your neighbour meant skimming the walls with Easi-fill?
Its not self-levelling though , nor could anything applied to a wall 'self-level' :?
I use paste stripping solution mixed in hot water and a large green scouring pad followed by sponging-off with clean water...
Failing that , resort to lining-paper for a guaranteed perfect finish :wink:
I just checked in my van, this week its been ICI Polyfilla, last week it was Mangers and some Vallance...Theyre all much the same from trade counters from my experience :wink:
I use caulk every day and the only time I ever see any signs of cracking is if I paint over it before its properly cured , you shouldnt need to prime it as its acrylic
Thats it, if you can get the second coat of gloss on within a day or two of the previous one it will chemically bond with the first (sometimes a tad longer for Weathersheild as it cures slower than internal gloss)