This has me very curious. Beauty Tips! / DIY matte topcoat: add cornstarch to clear polish to get matte.
I generally buy only metallics/shimmers/glitters and never mattes, 'cause I don't think they really "look" matte KWIM? These actually look matte. Might have to try it.
"You may not have lost all your marbles, but there's definitely a hole in the bag." Grumpy Cat