If by plaster coving you mean gyproc or knauf then use cove adhesive or dri wall ahd ,
If by fibrous plaster cornice , then try tile adhesive , fix n grout being the best
normal coving ie, bg 4 inch 5 inch etc, i use joint filler, the artex "fancy": cornice same again with a lick of pva on the back edges first, never ever had a problem wi any of them
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