I've turned it once, don't plan to turn it again.
That said ... what I did, and it gave me decent results, was this:
- use thin CA liberally as a "stabilizer/sealer" (not all at once, just a little area at a time)
- take some fresh 320 or 400 grit sandpaper and a flat scrap of wood as a backer block
- wet the sandpaper and the blank (this is important)
- wet sand using the backer block till you think you got all the surface flattened
- wash off the slurry, wipe dry with a paper towel, and inspect: any shiny patches mean you still have a low spot, you must wet sand some more
- is the surface a uniform 'milky' gray? if so, proceed to wet sand with micromesh up through the grits to 12,000 and finish off with some plastic polish (I use Huts Ultragloss)
- remember to sand along the blank to remove all radial scratches before starting on the next grit in the sequence
- remember to wash away all the slurry from each sanding between grits
HTH
The result I got ...