The KB Polysand abrasives are superb. I've been using them for years. The are quite pricey,though. Another excellent product is the Mirka Abralon foam-backed discs commonly used for polishing bowling balls or fine woodworking. Go with 4000 grit, the finest available in their line, for a smooth, satin sheen finish with very little material removal. The coarser grits are only necessary for preliminary sanding if you are doing a recoat with sealer or have roughened up the surface with a Magic Eraser. Do a search on eBay for "Abralon" and you'll find a number of vendors selling a 4-6 sheet assortment for under $20.00. Of course you won't have the cool OB1 logo.
Bill