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Cheers. I'm just going to chuck lime plaster at it and rub it 'til it complies. Then call a professional.
stevo_com-
Seems fine, what could go wrong?! :)
Looks like the worst side of mine is the original (presumed lime) plaster - based on what looks like horsehair bits to help it bind together. So I'm also not sure about infilling with gypsum plaster. It's not an external wall, so breathability isn't a big concern (although the other side of the wall is tiled for the bath/shower so could be hiding all sorts of hideousness) - I just want it to stay put!
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I did a a lot of fishing holes and cable channels + a 80x80 hole in a sloping roof. My attempt is no worse than the other plastering we had done by a professional. It just took 4 times longer I guess? I'm sure this doesn't scale up to doing a whole wall, but I would definitely recommend giving patches a go!
Cupcakes
rj
The other side of the room looks a lot better, and I would still be up for doing it myself, but if I've got someone coming in anyway then there's little point as it shouldn't take a pro very long to do a small area like the attached.
My walls are, as they say (in Scotland at least) "plastered on the hard" i.e. directly to the brickwork. Plastering onto laths seems like it would be much trickier. Good luck!