Stripping / Painting / Coating / Cleaning Rims

im spraying my frame soon just need best advise on stripping the paint, i usually use sandpaper but takes a while to rough it up....is it best to strip down to orginal metal or not??
tynan seems like the person to be aiming this at

Good god, I have another job now, the Claire Rayner of spray paint. :)

I am evil, so therefore I would use Nitromors, but if you are going to use sandpaper just take it down to the undercoat, that stuff is stuck on the bike very very well and you will get a better result if you work on top of their undercoat/primer.

No need to go down to the metal.