Can you use drywall coumpound over either old lime or gypsum plastered wall?

Yes, you can use drywall compound over old lime or gypsum plastered walls, but proper surface preparation is essential. For lime plaster, ensure it is clean and free of dust, and consider applying a bonding agent to improve adhesion. For gypsum plaster, make sure the surface is sound and free of loose material. In both cases, applying a primer before the drywall compound can help achieve a smoother finish and better adhesion.