Failed patches of Lathe and Plaster

Don’t do anything other than this ist carlite bonding you could use exspanding foam in the gaps of the lathes I don’t I mix it so it binds to the lathes ie gaps wait till it goes off and then fill out the rest with bonding then skim if your patching and not hole wall unibond the hole wall including the only when bonding has totally gone hard this way the hole wall goes off the same

For repairs like this, the best method is: Bonding coat to rebuild any deeper sections where the plaster has come away down to the laths. Scrim tape/mesh to reinforce the area Multi-finish plaster over the top to give a smooth, clean finish. For any small surface imperfections, Easyfill can be used before painting.

Step one open all all the cracks on patches or non skimmed areas. Step two instead of bonding just apply pva and runny form of powder filler and let it shrink inside cracks. Step 3 use any interior filler and sand it level back and please stop when is straight. Step 4 Now give another look and possible use good walls primer or undercoat on whole wall. Step 5 sand the whole wall and paint as many coats you want to get the colour you really need but better use less paint to cover more area than use more paint to cover less area.

Normally with properties that have lath & plaster walls and ceilings, the plaster itself is lime. So, either use lime or Another alternative is Renovating plaster and possibly high impact plaster as a finishing coat, both from Limelite Hope this helps