base coat adhesion

Base coat spray can. Hey, I painted a side panel with a base coat spray can, but it looks uneven? and some spots absorbed too much paint. Should I sand it or add a second can? It's dry—should I apply a clear coat, or will it not even out? What happen here I’m a rookie and need help fixing it...

I'm doing a rotisserie resto-mod project on a '61 Fairlane (2dr, full-size Ford). Logistically I need to first fully paint (sealer/base/CC) the following items: Firewall, under-side hood, under-side decklid, back-side of doors, door jambs, inner trunk. I'll be reinstalling doors, hood, decklid...