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stevo_com
Airhead
The only solution I've found that has worked long term is now called Fill-Flex, combined with Ultra Fine Elastic Scrim. From the usual suspects!
Only problem is application takes a few coats and the fill-flex is very difficult to smooth off by sanding. It does last a long time, not sure how long but it's been 10+ years in some places I've used it without cracking. It also shrinks so multiple coats are often required.
I apply some and press the scrim into it. Let it dry fully then start to build up very thin layers until it's almost completely smooth, then let it dry completely and by hand with a fine sandpaper very lightly feather it out. If you have some edges that don't feather properly you can use a bit of TX110 at the edges to blend it to the walls. Don't cover it with TX110 though as that will crack when the joint moves.
Easifill is designed to cover the joint tape between plaster boards before plastering, it's not a very good general filler.