Went on ok but was very rippled - like a beach where the waves have ridged the sand. I've patched walls elsewhere and made a pretty reasonable job of the skim coat so have to put it down to the surface.
It looks like some areas have dried as they would on plaster etc. but the patches of paint were "wet" so weren't drying at the same rate.
This is strictly a practise ceiling but I didn't want to faff about removing the plasterboard, moving the loft insulation and all the messing about that involves.
Would a neat coat of pva be better to cover/prepare the patchiness or give up and stick up a new layer of thinner plasterboard over the top and skim that etc. ?