We had some platering done and sealed it. We made the mistake by painting with silk emulsion . We have sanded down are going to try and paint it with matt emulsion. Is this the right way to go.

Make sure the plaster is fully dry, (not just looks dry). A moisture gauge can tell this: 18% or under is ok. Or if it's just a 3-5mm skim then leave for two weeks. If its had bonding then skim it needs to be left for a couple of months! this relates to the vinyl content in Silk, if you put a vinyl silk or vinyl matt on plaster still drying out it creates a seal and the moisture cant escape the only way it can is by pushing the paint off and making it fail. Use a contract matt (Dulux supermatt) if in doubt and 50/50 with water as a missed coat and then two coats on top then repaint in Vinyl Silk at a later date.

The right way is to mix 50/50water and White emulsion and was the wall with it then put your paint of any choice on top

i wood pva it first then 50//50 water and emulsion pva wood be watered down