Skimming over old plaster

30 Jan 2014
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United Kingdom
We have cut holes on the ceiling to access pipes and electrical wires. We have filled with new plaster board, with a view to over skimming the whole ceiling. What is the best approach just over skim in 2 coats or skim over the plasterboard patches to thicken out as they are 3-5mm shy of the ceiling, then two coats. Enthusiastic DIYer.
Also should i paint the ceiling with like a grit coat first, i have tried PVA before and not had avlot success, its dry before you start?
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it’s 2 coats whatever if you decide to skim .
if it’s fresh plaster id seal the dust with a weak pva. (really weak). then blue grit and skim. i wouldnt use pva on a ceiling to skim to.
you can use the grit on a brush in your patched areas to fill them out slightly.
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As some areas patched are around 2ft square, would it be easier to fill in with multi to the original ceiling level, then blue grit all over and 2 coat skim. Sorry noob plasterer.
yes it would give you a better result.
re-tape all the joints again if you know where they are and all the bits you patched in.

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