My seven year old Collings UT-1K has shiny areas in the satin finish in the lower bout where it's in contact with the forearm and near the sound hole where the right hand rests. A luthier I respect to told me that he could sand the shiny areas, but that he'll probably hot be able to exactly match the areas that are not shiny. The other option he offered is to buff and polish the body so that it's all shiny. Of course, I could always leave it the way it is as it's purely a cosmetic issue. Any thoughts?