If i may interject, i've never miscoated any walls that i've plastered. And i've nearly always been in a hurry so have painted as soon as its dried (usually within 2 days) and its also never caused me a problem.
However, i've just finished prepping my 25sqm extension and am ready to paint. This time round i will thin down some white matt emulsion and miscoat it first.
Is there a reason for miscoating other than saving on the proper paint?
Thanks, and sorry for the intrusion.