Painting Fiberglass hood

Hood is on and fitted.. hood latch working nicely, drilling holes for hood pins and hood lip molding trim next.

Then off it comes for sanding and prep. Picked up paint gun and supplies today.

On paint and primer. How much would you guess I need of each? FYI.. I plan to sand and shoot the go-wing to match.

A gallon of high build primer runs about $75. Is this a good fit?
US Chemical Eliminator High-Build Polyester Primer 300.G01

A gallon of matte black runs about $84
Summit Racing™ Hot Rod Flat Paints SUM-UP355G