So, I have an art project to complete and it requires painting the risers on staircases. The stairs are concrete and already painted, though I don’t know what with.

The stairs are on the interior of an elementary school, so I must be cautious of fumes.

What steps would you recommend and what kind of paint? I’m a multi-media artist but this will be the first mural type painting I’ve done and I’m a little out of my comfort zone. Thanks!