Chalkboards UKTin of Blackboard/Chalkboard Paint, Black, 250 ml (Pack of 1)

Thanks. so can this be painted on a wall? On an internal bedroom wall that has just been painted pink e.g.?

And why does it say that it is easier to repaint it than to simply wipe off the chalk as you would usually do on a chalk board?? Thank you!

Hi. I want to use this as a chalkboard with either dry chalk sticks or those liquid chalk pens. Is this the right stuff please? Thanks