Still using micro mesh (MM) on plastics. Might experiment with some polishing complunes ( just bought some to try ) . I still use either rhinogrip cloth backed abrasive to about 320 then switch to Abranet to 600 ( unless resinous then I use abranet all the way, on wood ).
On plastics I then switch to MM and go from 1200 to 12,000 wet sanding. I just put a towel over lathe bed bars and keep the MM wet with a bit of water to form a slurry and stop the MM clogging up. Bit messy but not bad.
Seems some then switch to polishing compound and / or buff. Now I've not tried buffing on pens . On metal objects, with great care to keep a good grip of the object, it's brilliant. On wood - I have had variable results but only started trying it recently so it will be me not the buffing system at fault.