Hi, any urgent advice hugely needed - thanks in advance if you can help in any way! Builders are currently decorating old 70s flat. In a kind gesture, they thought they would replaster the lounge. They have skim plastered onto the old plasterboard (walls and ceiling). This was left for a few days only (bit short?) to dry, and then undercoat and 1 of 2 paint layers applied. Got the dreaded call today that the plaster hasnt taken and is just peeling off. If this one of those things with plasterboard or is there an obvious reason for this? Just need help so it doesnt happen again as turning into a nightmare! Thanks so much