Plaster feather onto painted wall - dilemma

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Hi

I am installing a new bathroom. Pretty much the whole room was tiled below half height but I am replacing with wetwall (around shower bath) and emulsion – no tiles.

Stripping off the tiles was difficult; in some places tile+adhesive came off nicely but in others the adhesive was so strongly held to the plaster skim that it brought off the plaster, sometimes the board face of the plasterboard, and sometimes (due to my overzealous use of the hammer chisel) dug into the plasterboard, fracturing the internal plaster. I have “tidied it up” but removing any more of the tile adhesive would take a very long time, so I am resigned to the wall being pitted in places and raised in others (see photo showing part of the wall that will, eventually, be emulsioned floor to ceiling). I have successfully stabilised the area using PVA and online trawling suggest that my best way forward is to use bonding plaster to level the rough area then plaster skim to finish.

My dilemma is what to do across the paint line; above this is white bathroom emulsion - both wall and paint is in excellent fettle. Do I need to skim over the whole lot floor to ceiling or is there a way to skim and ‘feather off’ into the painted part a few inches, saving me quite a lot of skimming? Would this work if I first prepared the painted wall with PVA (+ plaster, for a key) .. or just PVA?

More information: walls are paramount board (two layers of plasterboard sandwiching a cardboard honeycomb) so there is no way to replace the plasterboard itself (which would seem over the top anyways) and dimensions are critical dues to the bath width and the constraints of the room so putting a dot and dab plasterboard top face isn't an option; it has to be some sort of skim

Any ideas please guys?
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Too much hassle. If can can plaster do the lot.
 
Thanks Joe ... since posting I have been thinking more and more about this and I'm coming around to the same conclusion. I'm a novice plasterer but skimming the extra wall which is already dead flat must not be too much extra hassle for me?!
In that case, would you agree with the advice to mix some diluted PVA with plaster (some say sand but I fear that would be a difficult mix to work with - sand keeps falling to bottom of tub?) to make an effective key for the smooth painted surface part of the job? The paint, from memory, is a silk emulsion so slightly "slippery" I fear.
 
You can get plaster bonding agents. Wickes do a good one. About £15 a tub.
 
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The stuff you want is called blue grit, it's pva mixed with grit and coloured blue so you can see where you have treated. It will give you a good key to plaster on the painted surface with confidence.
 
Great work guys - I've sourced it locally and now feel more confident about going ahead. Thanks for your good advice.
 

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