An enamel, you will

It all depends on what material will be used for finishing. For thin and light wallpaper, the walls are completely putty. For wallpaper for painting or dark wallpaper — it is enough to process individual sections. If you paint the wall with water -based paint, then the option of partial processing of the wall with putty is also possible. But if you had enamel before you have an enamel, you will need to put them up completely. It does not hurt to apply an abrasive net to putty and reliability of the result.