i'm in the middle of doing white/black for my interior too..and dammit it I'm too impatient and leave fingerprints on it! what are you using on it? I'm using SEMS vinal spray..seems to work, just okay..maybe i need to take more time to let it dry..yeah..thats the ticket.
Liraz Aerospace 303 and Vinylex will have a thin layer of protection on top of the paint. It will have to be reapplied and it is only temporary. I suggest you find a matte clear paint and use that as protection, that way it won't leave the painted area really shiny, but offer a thick layer of protection from chipping.