Hi,
I have started to remove wallpaper from much of the house that has had many coats of paint of the years - it's a very slow process and a real pain! Some walls have that wood chip style paper over it.
Thing is, although there are small scattered sections of plaster (white) most of the walls that have been cleared have what I guess is remaining wallpaper glue or staining, but mostly some small blotchy patches (brown colouring) all over the walls.
Is is ok to pva over the whole lot and skim - or do you have to get all the brown stuff off or seal it in some way?