- **Surface Preparation**: Ensure walls are clean, dry, and free from loose particles, grease, or dust. For old surfaces, remove all flaking paint and debris. - **Mixing**: Add Berger SPD Premium Putty to clean water in a 1:2 ratio (1 part water, 2 parts putty). Mix until a smooth, lump-free paste is formed. Example: 2 liters of water for 4 kg of putty, or 10 liters of water for 20 kg. - **First Coat**: Apply evenly with a putty blade, moving from bottom to top. Allow to dry completely. - **Second Coat**: Lightly sand the first coat with fine sandpaper, then apply the second coat from right to left for a smooth finish. - **Painting**: Let the final coat cure for 24 hours before applying primer or paint.