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I do this job very little because I don't do a building site work and builders all reckon they can paint anyway!
The piece of old timers advice I do have is to let it dry for 6 months. This advice is universally unwelcome! In any case a mist coat is the way to go. Some emulsions have higher amounts of solids in them, usually trade paints do, so choosing a high opacity trade paint for the following coats is helpful.
Give it as long as possible to dry, plaster is a crystalline structure that is still forming for a while after mixing.
It also makes a big difference how well it's been plastered, plaster should have a final polish when it's just drying that creates a very smooth finish. Most of the time if you put a bright light across a newly plastered wall you see multiple faults. I'm usually fixing all that 10 years later!
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Airhead
Painting freshly plastered bathrooms. What’s the defacto guidance - emulsion mist coast and then dulux eggshell? Looking at @Airhead for his master guidance 😃😃