[rtarh2o]

Lots of good replies Amfoto1 has some good advice for the Jeep hood but I have to disagree with his choice of grit sand paper.
I have painted many cars and very rarely use anything but 400 grit for the final sanding prior to paint. I usually start with 320 grit and finish with 400. I have tried 600 grit but honesty can't tell any difference in the final product between all of the above grits and the amount of sanding time is greatly decreased with the coarser grit paper.
I imagine most production shops use 320 grit just to cut down on sanding time.
From my experience 400 grit is about perfect, I would fear not having enough "teeth" for proper adhesion if using much finer than 600 grit paper.
Just my thoughts, check with your automotive paint supplier to make sure though.

Rusty