Leave the moldings in the installation room for at least 48 hours, without removing them. Maintain a stable temperature, avoid excessive heat and humidity. This step prevents future warping of the wood. Make sure walls and ceilings are clean, dry and dust-free. Repair imperfections: fill holes, smooth uneven surfaces. Remove the wallpaper from the molding attachment points. Apply an undercoat if necessary. Proper preparation guarantees optimal and lasting results. Take the time you need for this crucial step. Fill knots, holes and cracks with wood filler if necessary. Let it dry. Sand to obtain a smooth surface. Apply a primer to all sides of the molding. Measure and Cut: Accurately measure the length needed to cover your space. When cutting moldings, use a miter saw for clean and precise finishes, especially for corners. Applying the Glue: Use a "PU" (polyurethane) type glue suitable for wood. Apply the glue in a coiled pattern on the profile for maximum adhesion. Fixing: For mechanical fixing, use headless nails or screw the moldings onto a rail or use dowels. Lightly sand the surface for better adhesion. Use a quality wood paint that matches your doors or windows. Apply two thin coats, sanding between each application. Use masking tape to protect adjacent areas