Ceiling repair needs a lot of filler

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I’ve repaired a section of ceiling which is approximately 300mm x 300mm but the plasterboard piece I had is around 3mm slimmer than the existing ceiling.

How do I build up my easifill to this level before I smooth out and finish please?
 
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In hindsight, I could have put some packing behind this plasterboard piece but I’ve now applied the tape and first layer of filler...
 
I am using a 9inch filler knife to put this on and find that it defaults me into applying a thin layer as it dips into the inset part of this plasterboard. I hope that makes sense!

I am looking for tips on how to apply a thick layer of filler in such a situation.
 
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You need some kind of float that's big enough to bridge across the replacement piece of plasterboard so that it keeps the right level.

A piece of wood (or a spirit level) would do the job. Let the filler dry and then put a second layer on over the top.
 
That’s the sort of thing I was thinking but it scrapes the filler off at the same time.
 
You need something wide and flat that you can angle so that it presses the filler into the void as you slide the float over the top.

First coat can be a be scrappy, then use your wide filling knife to apply a layer over the top of the first once its dried that you can then sand flush.
 
That’s the sort of thing I was thinking but it scrapes the filler off at the same time.
Its I bit difficult to explain but:
If you're right handed start spreading just inside the right edge with enough on your spreader to fill that space.
Then move to the left and do the same but ease off as you get to whats been spread....repeat all the way across...the idea is your placing whats on the spreader on a solid area each time so don't pull off what you've put on.
The trick is learning how much is needed to fill the gap youve youve left each time. Its much easier with a skimming trowel or taping knife
 
I mixed it thick but when I was using a timber batten to smooth it out to the correct depth, it was just sticking to the timber and pulling away. A very messy exercise. I am encouraged by the technique described by @lostinthelight above though.
 

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