Yes, skim-coat plastering can be done on uneven surfaces. Skim coat plaster is designed to smooth out imperfections and create a level surface. It can hide minor cracks, dents, or uneven textures on walls or ceilings. Proper surface preparation, such as filling holes or repairing damages, is crucial before applying the skim coat. The skilled application of skim coat plaster can help transform uneven surfaces into smooth and visually appealing finishes.