I fought for a while with choosing to use chalkboard paint in our house. The thought of having to cover it back up later on was what was preventing me, but what's a wall to repaint compared to my kids enjoying expressing themselves?
Taped down the edges to plastic drop cloth to protect the floors.
Took the recommendation about the spray can of chalkboard paint. Not a good idea!
Second coat done with pint of chalkboard paint.
One day later, they were drawing pictures of our family!