Ramin Djehanian
we always use the plasterboard tape and then skim the edges with the corner trowel using easy fill. In come cases we also use the decorating fillers, but it is important to let the decorating filler (cork) dry over night even if it says one hour dry. Then before painting with emulation paint, we use oil paint first in order to prevent new cracks. Finally, painted with matching paint. It's a bit time consuming, but its the only way to prevent the cracks from coming back. If using the tapes on the flat are then it must be foddered out with easy fill, then sand and paint. never use decorating fillers on the flat areas. Hope that helps.
