Im going over the top of the POR-15 with a layer of underbody sealant anyway to get rid of the smooth finish, and that itself is going to be topcoated moonstone underneath so it looks same colour as car. Id recommend the POR stuff, can feel it sets rock solid when it goes on, the silver paint also has bits of metal filler mixed in so it works over badly pitted areas quite well hope all goes well for you on it