Preparing the wallpaper substrate

Preparation always begins with an inspection of the walls . Cracks, flaking plaster, old, stiff filler, peeling paint, and damp areas must be identified and treated. Light cracks should be opened, filled, and, if necessary, reinforced with fiberglass strips; more serious problems, such as active leaks, must be addressed at the source before considering any cladding.

If there is old wallpaper on the wall, the possibility and appropriateness of completely removing it is evaluated. In most cases, it is advisable to remove the existing layers using specific products or steam, followed by a thorough washing and cleaning of the surface. Leaving old wallpaper in place can cause adhesion problems and blisters, especially when there are multiple layers or the paper is already peeling.

Next, work is done on flatness and uniformity . Hollows, rough areas, or rough filler are leveled with fine fillers, sanded, and inspected with a raking light. The goal is to achieve a surface as smooth and even as possible, because paper, especially if thin or with a smooth finish, tends to "read" any underlying irregularities.

Applying a suitable primer is another crucial step. Depending on the type of paper, a water-based primer, a pigmented fixative, or a specific product recommended by the manufacturer is used. These materials reduce excessive glue absorption, improve the sheets' smoothness during installation, and promote even drying, limiting the risk of detachment, bubbles, or color differences.

Particular attention is paid to corners, edges, and critical points such as door jambs, recesses, pillars, and niches. These areas must be properly squared and smoothed, as the paper must conform without creating creases or abnormal tension. Electrical boxes are also prepared to allow for precise cuts and clean covers once the panels are reassembled.

Careful preparation requires time and attention, but it allows you to truly showcase your chosen paper. Without this preliminary work, you risk ending up with visible seams, bubbles, and imperfections that ruin the overall effect of the decoration.