I don't believe that it works "that easily." Osmo is not a miracle cure but just another supplier of paints, even though I generally like these products. Now applying a different product on top of one part doesn't seem like the optimal solution to me. Sanding is usually the cause of later trouble anyway. Tell me how you sanded it or how you want to do it now, with a machine, differently depending on the area, etc. In principle, I would recommend you to try it first on test pieces to see how it works. If you want to use Osmo, there are also various hard wax oils, the decorative waxes, or even stains.......