Steve Walker wrote:
muppet17 wrote:

I had a very similar experience with a new house. I found that
using a sealant on each and every ceiling in the house I never
has the cracking and flaking. The sealant I used was Dulux and
was quite expensive but did the trick. Having recently moved I am
now back to square 1!!!!! I will definately try diluted emulsion
as the sealant is horrible to use.

diluted pva

I'd use a diluted PVA as well but also sugar soap it first if there is
any grease.