Auto body repair & detailing: Fender painting, grease remover, luck mike

Question
I bought a used fender that has no rust or dents.  However, it is painted white and my car is painted red.  In order to paint the fender red what do I have to do to the fender before i prime/paint it?

Thanks!

Answer
ALEX.....CLEAN THE FENDER WITH SOAP AND WATER GOOD. REMOVE ALL GRIME FROM INSIDE AND OUT SIDE.
SCRUB IT DOWN WITH AJAX AND WATER...RINSE CLEAN.

SCUFF FENDER WITH 180 GRIT AND THEN CLEAN WITH WAX AND GREASE REMOVER

PRIME

SAND WITH 220/320 GRIT

PAINT

GOOD LUCK
MIKE