For a high gloss mirror like finish you might try out some real auto stuff. I just tested Meguiar's Deep crystal polish step 2 and Deep crystal carnauba wax step 3 and they rock!
You might also get some micromesh polishing cloths, they come in a variaty of grits and ends up on 12000! I usually start with 2400 or 3200 and goes to about 4000 or 6000 before polish and wax treatment.
The only thing to think about whit real auto products is to test them on that particular paint brand and type as some polishes will attack the paint and make it dull instead of bright and shiny. This is extra important if you use acrylics as they are more sensitive than enamels and laquers.
Good luck!
Niclas