painting trunk floor
You can topcoat over POR-15. Make sure the POR-15 is the actual POR-15 rust preventative paint and not one of their topcoat products (ask me how I know!), and apply it to the bare metal. Read their curing and compatibility directions on their website, then you can spray your final coat over it if you so choose. So, it can still be body color afterwards, especially if you spray the POR-15 application. Even if you brush it, it will turn out quite smooth though. Or, you can just leave it the way it is (black). Since it's inside the trunk, it shouldn't see much daylight, which is important since the main POR-15 product is UV sensitive. If it will see a lot of light, topcoat it.
