Real artists, help an amateur out.
I often sketch things on canvas in chalk. But I've been reading books about the Old Masters, and a thing they all seem to have in common is #imprimatura #underpainting.
So my question is; When working with oil paint, what is the order of operations? Are you sketching on primed gesso with something a little more perm, like graphite, and then imprimatura, or imprimatura, then a less perm sketch like chalk once it dries?