Hi, newbie pasterer :) attempted to skim a wall just to make it look better and smother, in a bathroom ready to be painted

It has since dried but is really dusty, have read this could be down to the plasters age, the mix and several other reasons. In the end I tried painting as the wall still appeared smooth, however there was a reaction with the paint in certain areas and with a couple of coats of emulsion (cheap white) im thinking lets start again.

So paint has been scraped off to reveal this dusty plaster coating underneath, i can also scrape my nails down the wall and it indents into the wall

So having learnt from this I hope to reskim, my worry is can I go over this dodgy previous attempt? If so do I need to treat with anything before skimming, i.e. pva?

What surface did you skim on to?

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it was previous skim maybe some paint beneath, did the normal pva over first etc

What plaster did you use???

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If its dusty then it sounds like your using too much fat when trowelling up.. Easily prevented - just keep your trowel clean when trowelling

it was just finish plaster from b and q,

geforce not au voit with the plastereing lingo, fat???

still no clearer with what i need to do though, can i just re skim/finish the exisiting dusty stuff? how should i treat it if so before the plaster goes on??

Fat is the technical term for plaster that's left over after a skim that you use to fill any holes/imperfections etc "working the fat" is what you do after you have done your first trowel, as its never 100% after the first trowel, no matter how good you are ;)

Sand it down and remove all the loose bits. Then PVA again and re-skim with Multi Finish, sold at B+Q

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