channel surfer -- I make a distinction between "performance sanding" and refinishing. Performance sanding requires only a light sanding (in one or more directions) with the grit sandpaper or Scotchbrite desired, possibly followed by a polish. Resurfacing requires starting with a very coarse grade of sandpaper, 100 grit or lower, to remove all but the deepest scratches and then multiple sandings in four or six directions with progressively higher grits of paper (example: 100 grit, 150 grit, 280 grit, 400 grit, 600 grit, 800 grit) until you reach the desired surface. Or, the easy way is to use a refinishing machine like the Hach. Hope I've answered your question. -- JohnP