Even tho the paint is reflected through a layer of glass you can still tell the difference between matte black and gloss.... acrylic paints are very thin and dont cover well. Latex paints and oil based work well and hold up forever. You have to scrape them off but its a thicker paint. Rustoleum matte black will do the trick for what ur looking for. Its oilbased. No need for non toxic paints imo.
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