I've got a Squier rosewood P neck that the previous owner defretted and then applied polyurethane. The finish is okay for what it is, but it has "orange peel" roughness; not enough to affect playability, but you can see it close up. It's a flat finish too. I'm thinking about either redoing it or adding more poly--I've got some MinWax wood floor coating--for a smoother, more finished look (if my meager skills can take it that far). My question: (a) sand over the existing poly and apply more coats lightly sanding inbetween and then buff out or (b) do I have to strip this thing down to bare wood and start over? Any recommendations would be sincerely appreciated. Thanks.