Yes you will need to prime it as jd said. The link below may be of help for painting door edges.

Do you prime before stone chip?

Depending on how *rec of the tum* you want to be about the underside of the car but i intend etch primering, prime then topcoat then stone chip. The arches inner wings etc will get topcoated again.

How do you prepare stone chip paint?

You need very fine grain, wet sandpaper and a steady hand. For small chip areas, wrap the sandpaper around the blunt end of a pencil, to ensure you don't scratch the surrounding paint. Apply a top coat or lacquer to seal the stone chip repair and allow to dry.