Novice here. Do I have to tape and joint blueboard before plastering? If you're not supposed to and I happen to already have done half of my basement before deciding to plaster, do I have to cover the joint compound with a PVA before applying plaster? There is a mix of drying and setting compound. Wasn't sure what I originally wanted to do so I just hung blueboard instead of drywall and just figured I'd joint and paint if I decided to skip the plaster.