I didn't take a photographs. I should have.
The room is not particularly hot or cold.
So, it's either more PVA, diluted I presume? Or some emulsion and then more PVA.
Thanks to those who have helped so far.
I skimmed a wall with multifinish, but there's a slight hollow. It's my fault. I never made it flat enough.
Two weeks later I pva'd and let it dry overnight. Then I pva'd before applying a layer of multifinish to fill the hollow. It looked good, but within a few minutes of applying the...