Captainkirk's Duster project

I'm about ready for primer-sealer in my engine bay. I've totally coated the surface with the flat-black RustOleum rust converter (love that stuff!) but now it's time for a primer-sealer coat. I'm looking for something in a spray-bomb. Any recommendations before I'm off to the hardware store? Again, this will NOT be going over bare metal, rather, scuffed up rust converter. Thanks in advance!