New plaster walls, sealed, but paint cracking & lifting off. Any ideas?

the plaster was completely dry before sealing with a proprietory sealant & when that ran out with pva diluted as per instructions. Put on a thin base coat of paint which has flaked/lifted up in certain areas. Where the base coat stayed ok & I added a second coat of paint there has been some further cracking in new... show more the plaster was completely dry before sealing with a proprietory sealant & when that ran out with pva diluted as per instructions. Put on a thin base coat of paint which has flaked/lifted up in certain areas. Where the base coat stayed ok & I added a second coat of paint there has been some further cracking in new areas. Wits end reached.
6 answers