Happy New Year to you all!
I have a wall with a few dips in it that needs levelling off, with a
skim coat of plaster being the last stage.
Could I level this by scratching the old surface, making it good,
slapping on some PVA and then a coat or 2 of undercoat plaster in the
dips to level it off?
Would the undercoat stick sufficiently to the wall?
Will I have to undercoat over the whole wall, not just the dips?
Thanks very much in advance for any replies given.