I am not going to argue with Phrozin. He gets results that are way beyond what I can do. Just to clarify a bit, I do use an orbital sander on the top and back of flat guitars. I don't use it on an archtop. This is not so much advice on my part as it is fear. I have had a few sand-throughs...all on archtops.

Will be good to have someone who knows their stuff go through the thread, particularly by someone with Phrozin's expertise!