I RECENTLY STARTED A REMODELING PROJ. THAT APPEARED TO BE A SIMPLE PAINTING JOB. DUE TO THE TERRIBLE CONDITION OF TWO OF THE FOUR PLASTER WALLS I DECIDED TO PLACE drywall OVER THE TWO DAMAGED WALLS. WHAT ADVISE CAN YOU OFFER ABOUT THE CORNERS WHERE THE NEW drywall MEETS THE EXISTING PLASTER WALL. SHOULD I TAPE THE CORNERS AND PLASTER OVER THE THE OLD WALL OR SIMPLY FILL THE GAPS WITH PLASTER? I WOULD APPRECIATE ANY SUGGESTIONS.