Plaster crumbling around failed patch on brick wall

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chrissy_a

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I'm doing up a place where there has clearly been some crumbling plaster on brick and it looks like the previous owner has tried to patch it up with a combination of a cut of plasterboard and some of that wall repair gauze, however it's still crumbling and the patch clearly was not up to the task.

The blue side is plasterboard and the other side is plaster on a brick wall. What would be the best way to fix this? My first thought was to try and squirt some expanding foam into the gap to fill it up, and then cut down and smooth over with filler, but looking for some reassurance/suggestions :)

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As a decorator, I would probably go with expanding foam to begin with.

Don't forget to mist the surfaces with water first. Not only does it aid adhesion, it speeds up curing times.

After dragging out some of the foam, I would apply SBR to the old (visible) plaster.

My filler of choice would probably be a lightweight filler such as Red Devil OneTime. Not cheap but a dream to sand and allows a degree of movement. It does however dry through evaporation, so leave it for a day or two before sanding.
 
But what is regular? Searching online most products either seem to be described as an SBR Bond or SBR Admixture
 
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