Wee update, the ceiling in question is a F*****g shambles putting it politely, the ceiling has been bonded, skimmed and painted once upon a time then sheeted over, then after the leak the water damaged ceiling had to come down (after i had been and priced it) thus exposing the existing painted ceiling.
Anyways my troubles were after pva'ing it i tried to put a coat of bonding on which just dragged about everywhere so sacked that.
I filled all the holes and put a strong coat of pva on and i will do the same tomorrow and just multi straight onto it, is this right or should i do something else in terms of getting a bond?