BMW Z4 M Coupe Art Car, Liquitex acrylic paint, Enamel
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Scatha, Under-Clearcoat

Even several layers of bare acrylic paint over such a smooth surface would be scratched off by the felt nibs of the paint markers I use for the linework. So the underpainting must be clearcoated for durability first. Acrylic Matte Medium should be used as it catalyzes the paint and provides a better tooth for markers and final paint layers than the Gloss Medium used as a final clearcoat.