i made the mistake of not diluting paint enough when applying to new
plaster. now, after disturbing it by chiselling for electric cables,
the paint has obviously not stuck to the plaster and is peeling
off.

now i am not sure whether to scrape the whole lot off (some comes off
easy, some not so) or use a stanley knife and cut around a border to
scrape up to. i'm not worried about a perfect finish and i doubt the
paint will peel by itself it was only because i had to do chasing.

anyway, my question, for the remaining areas that are now back to
plaster, whats the easiest/best way to dilute paint? obviously not in
the roller tray (as i found out before). can i buy a new plastic pot
and a mixer tool ? then pour the diluted paint into the tray?

another point.. last time i used own brand k & b paint which i dont
think helped, this time i've gone for wickes master matt emulsion.

i appreciated all replies. thanks