I need a technique that I am obviously lacking. I'm working on some 10-12 inch wide plates and bowls where the bottom of the inside should be flat, truly flat. Past eyeballing with a ruler across the plate or inside of the bowl, and using a small squared scraper, I put on some mineral spirits to see how the sanding works before putting on a real finish. Looks pretty good to me, but I still seem to get waves that show up when putting a finish on with any kind of shine.
My best shot is to just sand the daylights out of the piece with a piece of sandpaper on a wood block to smooth out any waves that circle the center. Is there a faster, simpler, better way?
Thanks, as always.