Look at my thread:
http://www.xtremesystems.org/forums/...d-Modification

Look at the picture where i mask off the fins.

use a scotch bright pad to scuff up the old paid, wipe it with solvent, mask fins, paint!

Let it dry in a cool palce for 24 - 48 hours. If you gonna bake it on like i did make sure its dry first.