Hardwall on celcon blocks?

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New Member
Hi All, newbie here and diy plasterer

I've knocked off old plaster and render off a celcon wall. I'm having laminate wallboard fitted

My question is it ok to use hardwall without skimming as it won't be seen. Some of the blocks were damaged being so soft. Can i fill with some sort of sand/cement? Or hardwall over the damage

Looking forward to some good advice. Cheers