This metallic look filaments are perfect for car 3d prints. Best results are @ 0.1 mm layer heights. I have placed starting points of each layer at bottom side of car. You can do this in Simplify3D. Nice tutorial is here: https://www.youtube.com/watch?v=KhFcdjlbS5Y
All markings from layer starts are hidden and surface is much more clean.
Look at results bellow... happy printing, PrintedNest