Plastering advice for small bathroom ceiling

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I have posted on other forums too, so apologies in advance if this is causing anyone deja vu!

To cut a long story short, I have attempted to plaster a small bathroom ceiling myself (2.4m x 1.2m). I used Thistle Multifinish and did the usual recommended two coats with wet trowels and a polish. The finish was ok-ish, but my arms were ragging at thr end of it so I knew it was going to need extra work once dried and cured.

So, following some advice I decided to do the mist coat first in order to highlight areas that needed filling/sanding. The problem was is that the paint I used for the mist coat wasn't right for the job (Zinsser Permawhite) and was flaking. So I had to scrape back all of the mist coat. No problem, that's done now. However, it has highlighted some issues:

1. I had to be quite aggressive with my scraper in parts, which has inevitably caused more imperfections that need filling/sanding
2. Areas of the initial skim must have been quite uneven and thin, as in places my sanding has nearly gone back to the plasterboard
3. the whole ceiling is a bit undulating, not that you would notice, just by maybe 5mm

On that last point, looking up at the ceiling from floor height, I can't tell that the ceiling isn't flat. It is only when I get a level up onto it that I can see the undulations. So I am thinking this might not be as much of an issue as I think it is.

So going forward, as I see it, my options are:

1. Do another single coat Multifinish skim to try and get rid of imperfections and level out celling a bit more
2. Use Gyproc EasyFiller to fill in imperfections, sand back and then live with it not being 100% level
3. Use Gyproc EasyFiller to do a full skim coat, similar to option 1

My question is, which of the three options above would be best? Or would they all be OK, and it's just a case of picking a preferred option? Or am I missing another option?

TIA
 
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Seal and skim again. Shine a light across to create some critical light which will show you imperfections. Might look terrible but do the beat you can.
Bodge a electric sander on a vacuum and run over when dry. Cheap orbital is best with 120g paper or mesh.
Shine a light across again and fill with toupret powder.
Sand again.
Then you have options.
Just go ahead with perma white or use an acrylic primer undercoat.
You can sand the acrylic primer undercoat and fill over but not the perma white.

Perma white won't like being applied over contract emulsion but will be fine over acrylic primer undercoat
 

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