[Russell Sobie]

Most of that information is in my very old tutorial (which I wrote while I was learning the software). But yeah. You delete probably 75% of the model... anything that paint doesn't go on can be deleted. I sometimes leave (and lock so I can't paint on it) portions of the model for reference... things like license plates, emblems, wheels on open wheelers so I don't put logos or anything behind them on accident, etc.). And Mudbox intergrates with Photoshop by allowing exporting to PSD files directly. You can even export to PSD, and then while editing in Photoshop, Mudbox is watching the file. If you save it, it allows you to immediately re-import it back into Mudbox. I typically don't do that since the turn around time is a bit slow for my tastes... Usually it's:

1. Prep a stencil of stuff in Photoshop (logos/sponsors/patterns/names/numbres)
   
2. Import the car into Mudbox
   
3. Clean up the model
   
4. Paint all the colors/stripes
   
5. Paint all the additional design stuff on one side mirrored along the X axis
   
6. Export to Photoshop.
   
7. Optional: Clean up anything horrible due to poor UVs and re-import back into Mudbox for more painting.
   
8. Test the skin in CM Showroom.
   
9. Replace all the backwards word-based graphics that are mirrored that need to be on the other side of the car and make any final changes.
   
10. Final export to Photoshop.
    

http://www.simracingsystem.com/showthread.php?tid=2249