Plaster kitchen ceiling or overboard?

[dormermike]

Hello

Kitchen ceiling was wallpapered and have removed that with a view to painting it. I can see lines - are these the joints between the boards and how can I prevent these showing through the paint please ?

I did have a plasterer around to quote for skimming before the wallpaper came off and he advised getting it over boarded. The condition looks good to me, so I don't see the point in overboarding unless I'm missing something obvious ?

Also i'm assuming i need to wash the plaster with sugar soap to get the wallpaper paste off, is that right, before mist coating then paint?

thanks
Mike

 

[Bonni]

Sand, powdered filler, sand. Repeat where required.

Brush on Zinsser Gardz, allow to dry, then emulsion, then allow to dry. Fill and sand as many times where necessary, then emulsion enough coats until you're happy with the finish.

Sugar soap is outdated.

 

[HERTS P&D]

Over board it, it adds extra fire protection.

Andy