Fixing wall - best compound to use?

[Koshi]

Hi, i've repaired this section of wall and built up with sand/cement.. i need to bring up as a finish filling a depth of around 2.5cm and then paint same as rest of the wall... whats the best method?

Thanks in advance!

 

[Alastairreid]

Bonding plaster to bring near flush with existing, let it take up for a couple of hours then a skim coat of finish.

 

[NickB_99]

Hi, i've repaired this section of wall and built up with sand/cement.. i need to bring up as a finish filling a depth of around 2.5cm and then paint same as rest of the wall... whats the best method?

Thanks in advance!

As ker-plunk, but ensure your finish corner bead is level with the existing plaster you want to work to.
In the picture it looks a bit low.
Put a straight edge or spirit level on the existing plaster and over the bead to check