Why does my finishing plaster always crack as it dries?
I recently repaired the plasterwork around a fireplace which I have
installed.
The browning went on fine, then the finishing coat, which I re-wet and
polished a few times.
All seemed fine, quite a smooth finish for me, then over the next week it
cracked and came away from the browning coat.
I always try to key the browning and have used pva to give better adhesion.
Is it because I am not letting the browning fully dry before finishing?

Thanks,
Ian
Perthshire