On Oct 10, 2:53*pm, Stephen wrote:
Hello,

A couple of years ago we had a room plastered. We allowed the plaster
to dry and then we sealed it with a primer and then we painted it.

What did you use for this first "primer" coat? New plaster should have
first a skim coat of diluted emulsion (opinions differ, I dilute with
25% water but others seem to use more). This bonds with the surface of
the plaster and allows subsequent coast to bond securely.

Cheers
Richard