If you mean to make it look vertical (not horizontal) you could do it with expanded metal, but how would you fix the mesh to the wall?
And it would probably need to be done in two or three feathered coats to get it right.
hello again I am still deciding the best way to correct the slanting wall to make it horizotal as u see from photo I did bo use a spirit level in sime parts when building wall so it is slanted in some parts
I was thinking of putting chicken wire on wall and rendering on top till it is straight
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