Hi, I just had my whole house replastered. The builders gave the plaster around 15 days to dry before they use Leyland Trade Super Leytex matt paint as an undercoat. They then left this to dry for a week before putting on dulux silk paint. It's been around 6 weeks since all the painting was done and already the paint is starting to bubble and flake off. They have sanded down and repainted but same issue. They then sanded down and said they injected damp proof stuff in and then repainted, but yet again the bubbling has come back. Any ideas what the issue could be?