I would carefully clean the shutters with TSP or similar, and then use a spray paint specifically for vinyl and apply 2 coats. I cannot comment on ARC requirements as these can be dependent on where you live. I would contact and get approval (if necessary).
Also, use painters tape and number the shutters and indicate TOP so you get each one back to the same location as these can easily have the mounting screws in slightly different locations.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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