Tim S wrote:
Stuart Noble coughed up some electrons that declared:

Apply one dilute PVA to soak into the bare plaster bits and another less
dilute coat an hour (+/-) before plastering and plaster to the the tacky,
not dry, surface.

Tacky or dry makes no difference IME.

Fair enough - I was going by quoted random wisdom, that may be wrong...

Logically it doesn't matter because the pva isn't acting as an adhesive,
it's only reducing the suction of the plaster.

Also, it's not always practical to time the plastering that accurately.
At the rate I go most of the wall will have dried anyway.