Primer or sealer over new plaster?

Ok lounge walls nearly finished ! Maybe this weekend......:D
Skim coats over sealed older plaster walls............so do I need to leave it to "cure"?
Or can I whack a coat of primer on it and proceed to pick out colours?
...........or does it need to be sealed in some way?
I am going with flat ( very flat!) acrylic paints........
and can I point out that all those videos teaching you to plaster must have lovely straight walls! its not that simple on wonky walls! I have the blisters to prove it!
cheers
Jan


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