Prepare this mess for painting

[pcaouolte]

I have a small cloakroom that needs redecorating, I would like to paint the walls.

The walls were wallpapered and when I removed the wallpaper most of the paint underneath also came off so I am largely back to bare plaster which is in good condition.

The problem is with the top 30cm of the walls. At some time the room has been increased in height and the plaster on the top 30cm of the walls does not line up with the plaster on the bottom part. A poor effort had been made to blend the upper plaster with the lower but the blended part also came off with the wallpaper. I am now left with a step of about 3mm where the upper plaster joins the lower:

Should I try to sand down the top part to meet the lower part or fill the lower part to meet the top part?

 

[freddiemercurystwin]

Are you looking for a completely flush wall where no evidence ever exists or just to blend one face to the other?

 

[pcaouolte]

I'm looking for a decent finish without having the walls reskimmed by a professional plasterer. Something that I can paint with matt emulsion without an obvious visible join.

 

[Wayners]

Get a ready mixed wall smoother and blade.
Sand with 180 grade sandpaper but use something flat so area is sanded flat. Don't hold sandpaper as your hand is not flat.

Look at the Toupret wall smoother. Watch video on how it's done