For engine cowl, after drilling and cutting holes, I used Dremel to "draw" the panel lines. Then one layer of primer and aluminum color. When color dried, I used a wet cloth to apply a thin water layer on the surface. Immediately I throwed some salt(medium size ) and let it dry for a while. Then a single layer of matt black color was sprayed. The cowl dried for more or less three hrs and then using a soft cloth, I started to remove the salt. Finally I sprayed a mixture of diluted gray/black color for extra weathering.
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