I have an interior cinder block wall in a room in my basement. I'm making this room into a bathroom. I'd like to conserve space and not frame this one wall. My goal is to have a smooth wall to match the sheetrock walls in the rest of the room. My questions are; Is there any type of plaster or mix I can spread on the block? If I use a mix or something, would caulking be best to make the joint at the sheetrock ceiling? Also I want a shower kit on this block wall, should I do anything different behind it? And a little off the subject is green sheetrock needed on the ceiling & every wall in bathroom, or just where it might get wet? Any input would be appreciated. Thanks