We have a bathroom with slate on the walls and floor. It's a good finish in many ways but makes the room dark. Could we paint it with enamel paving paint, or whitewash it? That would retain the interesting texture but lighten the room.
I trawled the web looking for answers. A home reno site said not to paint slate floors - too subject to movement - or fireplaces - but that could have been because of the heat.