Thanks for the reply.
The old render was knocked back and the sealant applied before the new render went on top.
The refinishing was done after the first job failed.
Grass/soil on the other side wasn't changed at any point.
Might have used the wrong term - stepped profile refers to three...
I had the original garden wall in a 1930s house refinished about 6 years ago. It has a stepped profile at the top which I wanted to retain. These are pictures (from the plasterer's website) during the job. I was very happy with the finish and painted with a couple of coats of Sandtex a month or...