Hi. I have recently acquired a villa in Greece and I have a plastering problem I would like to share with this community hoping for some advice on how to deal with it. I have been experiencing many pop outs in the plaster. The result is a crater which must be filled and painted. I typically get around 80 every season. The problem tends to occur more in the winter when there is more humidity. I believe that the quick lime used in the process was not properly hydrated so it tends to expand whilst absorbing humidity causing an expansion of the plaster and hence the pop out. Is there any paint solution I can apply to the walls to eliminate this problem like a one way sealant to allow the walls to expel humidity but not absorb it? Many thanks for your help.