Masonry paint - just a bit for the edge of 2 outdoor steps (Stanley Gate L39)

My new home has 2 dodgy steps on the path that are a trip hazard, so I want to paint the edges white. I have googled to see if my emulsion or gloss will do, but apparently not. If anyone could spare a bit in a jam jar, I could ride over on my bike and collect! I am in Bickerstaffe L39.