As others have mentioned, sanding or not before apply of the paint should not change the finish. The most likely reason of your results in the picture is that you did not apply enough paint and the paint is too thin. Anyway, I always sand all the parts and prime them before painting. And I use gross paints for almost everything and then use matte coating to matte down any parts I want a mat finish. Just make sure that you don't over do the matte top coat, if not it will "fog" up the surface. (
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