Who makes a quaility 60% Gloss Black Paint (aerosol) to cover the underside of a camaro hood?
That's a lot of sq. ft. for an aerosol but SEM is a quality aerosol if cost is not an issue.
I used Krylon and Rust o leum on my car.
Sauron turned me on to the SEM and it is high quality paint.
You can get custom blends of SEM loaded in aerosol cans for application as well for small paint jobs. It works well if you don't have access to a booth but still want to match closer than off the shelf for a particular color.
I would recommend using a gun for that large of an area. If the paint flashes before you get the whole hood painted you will notice striping. Better to apply it faster. Just a thought...