Ndondomeko pretreatment utenga watsopano wochezeka sanali poizoni silane, amene ali pamwamba ndondomeko zoteteza chilengedwe mu makampani. Kutalika kwa zokutira pamwambapa ndi 50 ~ 80 μm, ndiyosalala, kukana kwazitsulo zazitsulo ndizochepa, ndipo kukweza kumakhala kolimba.