Base paint for problem utility walls

[busydad]

Hi, I’ve recently painted my utility and whilst painting I found out there was backing paper behind (as when using the roller a big piece came off). I’ve filled where that was and repainted but it shows quite badly as a patch. There’s also patches in lots of places and some ‘cracks’ plus an area lower down which looks more like rising damp.

Other than re papering are there any paints which may help to use as a base under the emulsion? I’ve used some Zinsser products in the past, but not sure which if any would be best (or a combination)? BIN/Gardz etc?

Thanks

 

[foxhole]

Looks like penetrating damp , exterior photos ?
Dark colours will highlight imperfections.

 

[busydad]

All of the walls are internal (it’s an old terrace). There’s a lot of backing paper in the property so assumed damp has been/ is an issue

 

[foxhole]

Terrace houses or usually built with utility rooms , is it an extension?

 

[busydad]

That’s a good point, yes I think it is part of an extension, so one of the walls is external and two others were, but are now internal if that makes sense.