Filling holes in ceiling prior to plastering

[woodman-46]

Hi,
I have taken a wallpaper covering off a landing ceiling and the surface underneath is in ok condition apart from a few areas. These are mainly cracks or gaps where old filler has come loose and now fallen out. It is going to be freshly plastered over eventually.
I have cleaned these cracks and gaps back to solid but want to fill them with something that not only fills the holes but also bonds as well to give integrity to the ceiling again. Apart from normal fillers such as polyfilla which won't do that job are there any suggestions please. One or two gaps/ holes are 1/2 inch wide by a foot or so long.
Thanks

 

[bobasd]

is the ceiling plasterboard or lath & plaster?

"back to solid" - solid what? ceilings are usually pinned to joists.

 

[woodman-46]

I thought I had replied but it doesn't seem to have logged here !. The ceiling is plasterboard , basically sound but a bit beaten up on the edges. It has been filled in places over many years, I have cleaned/ raked out any loose stuff i.e " back to solid ".

 

[bobasd]

why not post a context pic and some detailed pics?

 

[Alastairreid]

Easi-fill.