Plaster doesn’t seem to be drying on chimney breasts

[Gordy26]

My knowledge isn’t the best so you’ll have to bear with me. I had my chimney breasts plastered 2 and half weeks ago and it looks like some patches aren’t drying, I’ve kept the heating on constant the last 4 days and some windows opened a little downstairs but doesn’t seem to be doing anything, il upload some pictures. Any advice or anyone know why it isn’t drying? Thanks

 

[blup]

Plaster draws in moisture from the chimney walls which will hold damp, give it a good few weeks or even months. Some plasters contain greater lime content to help the walls breathe. What type of plaster was used?

 

[Gordy26]

I’m pretty sure it was multi finish? Not sure what that was exactly, it was dot and dab plasterboard already on there, so it was pva’d then plastered?

Plaster draws in moisture from the chimney walls which will hold damp, give it a good few weeks or even months. Some plasters contain greater lime content to help the walls breathe. What type of plaster was used?

 

[blup]

I would give it plenty more time to dry