Hopefully a quick question.... I have a room dry lined with insulated plasterboard, and almost ready for a plaster skim. How do I deal with the outside corners around window reveals? Being the insulated kingspan board, there isn't a batten immediately behind to screw into to hold the beading. The edges of the board butt together 'reasonably' well. Can I use plaster or jointing compound to stick it on? What about the metal reinforced tapes?