just skimmed my mates ceiling all went well.............. left it for 6 days and painted it with crowne mat emulsion again all went well.............. 2nd coated it today and when a rolled over a patch with the roller the plaster came off on the roller??? only a patch the size of a cig packet but i can see i could pick off around it all day like flakey paint ??? what have i done wrong???? it seems solid everywhere else?????? rest of ceilings and walls are fine??? any idea's????? i've covered it with a smoke alarm so got away with it but whats gone wrong???? like i said solid everywhere else???? ??? thanks in advance