While not required, priming the shutters with a latex primer before painting with acrylic latex paint can increase adhesion and allow better coverage by the top coat. Krylon Fusion paint is made to adhere to plastic, so plastic or vinyl surfaces shouldn’t be primed before painting.
What is the best paint finish for exterior shutters?
Generally, gloss paints are not used for exterior walls. For exterior doors, shutters, gutters or trim, use a semi-gloss or high gloss finish. For exterior walls and siding, choose flat, satin or semi-gloss finish. For wood siding, use a flat or satin finish.