Must I always remove old wallcoverings?

The surface must meet the following requirements: clean, dry, solid, smooth, lightly absorbent, neutral and of a uniform colour. For an immaculate finish, you must first remove any existing wallcovering. You can use a stripping solution for relatively small surfaces or in a small, closed area. For larger surfaces, however, it is best to use a steamer. As the latter uses as combination of water and electricity, please observe the necessary safety measures.