This is the easiest and most attractive way to increase traction
on your steps. Or you can buy non-slip tape from your local home
center. But the I feel that the strips of tape on steps are very
commercial looking and unattractive.
Here's what you can do to make your steps safe without anyone
being the wiser. Next time you next to seal or paint your steps,
just add a little clean sand. You can use regular sandbox sand
that is sold at your local home center. Just mix a couple handfuls
of sand with your paint and then just brush on. When it is dry
....instant, almost invisible non-slip surface.