It ok don't worry about it a thing cos everylitle thing going to be or right ,it the bab not dried out ,give it time ,happy days20 year old property, sitting room, dining room gable walls. Never seen it as bad, considering age of property, woman says it has been painted at least 4times since build, keeps coming back.
I'm thinking it was painted too early at build, owner never complained, anyone seen that bleeding through wallpaper.It's had 20 years to dry . Bit tight with adhesive.. I.m think I g someone's forgot to insulate cavity lol
Yes, suggested oil base undercoat, noticed its also on a internal garage wall in sitting room, so I guess it was painted when wall hadn't dried out.Weird. Tried paint block?