Touching up Cement render

I'm giving the outside a fresh coat of Paint, and touching up here and there where it's bit tatty.

Cracks are fairly straighforward with some filler and a bit of stipling before the paint, but I do have a few small areas of scabbing. Rather than filler or cement is there a special product anyone can recommend for such a job ?.

Nothwithstanding any other ideas, I did bring a tub of this out with me in readiness.