Assuming you are looking for a waterproof paint to also address water getting in under the steps, the area is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend KoverTek TekPur Waterproof Balcony Kit, but this is only available in grey.

If the paint is purely for external application to concrete steps in a domestic application with no waterproof nature required for the structure we can recommend Coo-Var Acrylic Floor Paint.

This can be mixed in many RAL and BS colours.