Prep for spraying latex on metal Garage doors

Hey there, my first post

I picked up a set of new metal garage doors from a customer today and I've got them setup to paint in my shop.

We would like our finish to be an Acrylic Latex, nice black color.

Now im wondering what i should be priming these with, I have some fresh start, only a lil bit of Zinser, aswell as some red oxide primers.

I thought about a quick scuff with a scotch pad and then just shooting the fresh start primer on it.

Any suggestions on a good system, this is a higher end home, and longevity is very important.