Maybe condensation. With the damp plaster there is lots of moisture absorbed and condensation forming on the cold pipes. Give it time to dry out. Hopefully it will disappear
I've patched up a few with blown areas but its better to get the lot off.
Seal
Skim
Surface adhesion and how solid it is needs to be tested before skimming to avoid this trouble
Get a summer fan in room to move air along with dehumidifier. Maybe still a little damp in places.
Don't know a much about underlay. We used cloud 9.
Also cloud 12
Don't fully seal until dry.
Product needs to harden by drying to create a seal.
i would seal. 24 inch fan to dry off quicker. Another coat and when tacky skim.
One thing though. I don't think plaster sticks better when tacky Vs dry. Watch the the test on YouTube
Use easyfill 20.
Start with a smooth sealed surface.
Scraper or trowel to pattern.
Old plaster or old english plaster is the pattern. That's what I called it.
Think some called it Spanish troweled...see it on the outside of villas
No dpm under fire place concrete because of heat.
Think I'd dampen down.
Apply cement and water with a splash of pva in to create a bond.
Give it an hour then a bag of leveling screed
Get a summer fan in there to move air about. Keep it going as much as possible.
Open window a bit when the weather is dry.
Air movement is better than heat.
Thick plaster and closed room causing drying issues maybe.
Some cove adhesive is board adhesive in a different bag flogged for sticking coving.
BG stuff is best. Probably the only one that will stick to emulsion I've found.
I always sealed surface to help coving stick and never had a problem.
I always sealed cut joints and blobbed with adhesive and...
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