You can deal with the most common errors during repair. Leader is the presence of a gap between the baseboard and the wall. This may arise if the wall is not very even. This error can be avoided before starting wall painting. Or before the wallpaper will be glued. Attach to the places where the skirting board will be attached, the verification line. If there is a gap, then the wall still needs to be aligned. Check the room around the perimeter.