Dark paint - undercoat/primer needed?

[Snookums]

I’ve always painted walls some kind of light colour whether it’s white or egytian cotton

we finally have decided to rip the wallpaper off the hallway and go for a dark coloured feature wall. Other half is set on barrow and fall stiffkey blue, my question is will I need a primer/undercoat going straight from plaster to a very dark colour.

Also any tips for those who have used barrow and fall would be appreciated. At the price I’d rather get it right first time

google was just full of companies saying you need to but obviously they are just trying to sell more so thought I’d consult the “experts”

 

[200sols]

Bare plaster? You want to mist coat it first. Just water down some white paint.

 

[eviled]

I’ve painted my f&b onto screwfix bare plaster paint
F&b say you need their dark undercoat but I’ve never bothered

 

[Bunka]

I've always just done two or three coats and had decent results.

 

[pp111]

Just needs more coats.
If there was wallpaper on the wall, just make sure you have all the glue off.
If a bare plaster wall has been wallpapered then you really need a specialised primer. Zinsser do one. Zinsser All-coat. This is to ensure that the paint sticks to the remnants of the wallpaper glue.