1) Remove broken slate and chip out old cement.

2) Make sure all surfaces are level. Make sure you chip out
and clean all areas where you see cracks.

3) Measure twice before you cut holes for railings.
Use 2 part mix epoxy for holes.

4) Once you put enough mud on surface for slate, slide on
carefully (easy to break).

5) Use Masonry cement.

6) Drying - Put plastic on cement when drying if you
want smooth. Broom sweep if you want a brush finish.