We have just peeled off some old paintwork from our walls.
The wall is dry and the plaster looks in good shape for the most part but it is old and "dusty" - i.e. you can rub your hand over it and it generate dust - unlike new plaster which has a firm shiny finish. I am nervous that if I paint on to this the paint will not key/adhere properly.
What's the correct thing to do? Jut give the wall a good wipe down and then paint with a diluted emulsion for the first coat or fist seal it using PVA?
In my limited experience, painting over a PVA sealed wall is a real pain - the paint does not cover well and it requires more coats.
Any advice gratefully accepted.
A couple of follow up questions: - 1) If I do seal the wall, do I still need to water down the first coat of emulsion (as if I were painting on new plaster)?
2) Is there a difference between PVA sealer (e.g. Unibond) and PVA wood glue . I have 5L of woodglue in the garage that I will never use - could I dilute this down and seal the walls with this?