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The only one I've used is my own Festool one which is a 225mm head and comes with a specific hoover designed to deal with plaster/filler dust. It's not that easy to use, pretty heavy on a long handle and you need to be careful with it. If you are using easy fill you can wipe the surface with a sponge and it will come up very flat, I know it doesn't seem like good advice but just try it and avoid years of sanding.
The other worthwhile product you might want to deal with your newly filled walls is Gardz. Well worth it for walls with patches of filler on, only problem is its only available in large quantities.
Paint spraying is all about masking and dealing with overspray, you spend a lot more time prepping and taping the skirting etc. Then you either have decent extraction for the overspray or risk covering everything with fine dust. It also takes time to clean the paint from the sprayer once you've used it and failure to do that will ruin the spray equipment. That process requires a fair bit of water too. If you are prepared to prep everything (all the rooms) that you want to paint then do them all at once with extraction you might be happier than using a roller but a 12 or 18 inch roller does the job so quickly that you may as well invest in a wide roller bucket, 18" roller and Wooster roller pole.
Spraying is generally worthwhile on surfaces like doors that you want a flawless finish and where they can be painted in a specific area which is set up to deal with overspray.
The Painters Pit Stop forum has a lot of threads concerning spraying.
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Airhead
@lynx
So Drywall sanders - What would you get. Looking to sand some plastered walls that have had the paper removed so lots of gouge marks and poor fillering. So was thinking sand, then Easy fill then sand again smooth walls then paint. I hate lining paper.
Was looking at electric paint sprayers, are they any good? Looking to repaint a few rooms after the sanding white. Thought the quickest was was to use a electric paint sprayer.