you can use thistle bonding backing coat them skim or wicks bonding agent and skim and good old pva and skim. Everything depends on the state of the ceiling.
we had to dab a concrete ceiling with thermal boards once lol. then chuck 6 fixings in once it had set. he didnt want to pay for all the battens and screws, yet paid for loads of dab and the board fixing screws. right cowboy job.
I skimmed out the flat ime in at the moment last summer all poured concrete walls built in 1976 dry as fcuk 5 coats unibond still strugled WBA worked better, never again board it.
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