John, the "flat" spotting on previously oiled stock finishes just sort of disappears in the process. Mike Petrov used it to help finishes on some of his rifles. The great success is that with a brief application, the visual damage just disappears. I just used a bit of it on a John Manton stock that had water like damage in front of the buttplate. Now, you don't see the damage. Raw linseed oil does dry, but takes more time than oils with dryer additives, but I have lots of time on my hands and the absence of dryers gives more time for the oil to soak in. I don't think the raw linseed oil would work as well on epoxy or other plastic finished stocks, but I have none of those.
