Tricky Dicky Wrote in message:
I would use dry wall adhesive or coving adhesive which is very similar, both will need some support initially. If you are plastering walls around the opening then you can apply plaster direct to the lintel just press the initial bonding coat into the gaps to maximise adhesion.

Richard


I wouldn't do that as if the rest of the ext walls are insulated
the reveals will become the coldest place = condensation, mould
etc.

I also don't think plasterboard adhesive necessarily sticks well
to the insulation of insulated plasterboards.
Depends what the insulation is faced with ? Paper? Foil? Foam?
--
Jim K


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