slacky wrote:I'm struggling to get a solid edge just seems like it wants to keep flaking.
no I got a plasterer to do the work. Not to happy really as cracks started appearing everywhere same as in the bedrooms. He seemed genuine enough took his time gave it 2 skims but still cracking
If the cracks are part of movements of the house or whatever they would not get any better by being plastered. The same by being filled. They should be taped and plastered or taped and filled and or taped and use flexible fillers.
As far as getting a solid edge on the paint use a small (narrow) scraper like so:
http://www.toolstation.com/shop/p96313?table=no (the middle one of the three). It will have a fairly blunt edge. Using your finger tips and being as gentle as possible run it along the bare plaster and bump the paint. The loose bits will come off. You do not try to push it under the paint as it will then come off.
Judging by the photos you have not lost that "much paint" yet because of flaking. Stop being a chicken
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I would leave your father out of it. He know what he knows, it is now about what you learn.
Some paint says for "new plaster" but that is meaningless marketing. You need non-vinyl and non-acrylic paints for new plaster that is potentially still drying out. If the plaster is dry any emulsion will do (as I said on my other comment it applies to Crown trade paints) but in either case paints need dilution with clean water (how much dilution is another story). Crown (again), for example, make only one paint that can be used on new plaster without dilution, recommended for work where there is no easy clean water availability.
BTW. I have no shares in Crown, but the nurse told me I have a fetish about reading paint specification sheets.