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So from my experience and a trade decorator confirming, it's something to do with the fact that it reacts weirdly if not painted perfectly at once. You don't have much margin for error in comparison to Dulux/Leyland stuff.
If you repaint a little section over it will show quite significantly (Something to do with thickness of the different layers etc ...).
Leyland latex stuff and Dulux I've found brilliant
Why is F&B diff to apply?