Paint each gem individually, and feel free to use as many colors and coats as you wish. I like to use my daughter’s glitter clear coat to add glitter to a few of my gems. To make them all very shiny, paint on a glossy top coat after all the colors are dry.
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this isnt a very green upcycle as most traditional nail polishes are made using toxic chemicals
Is, too, since upcycling itself is green. We usefully re-use our materials, even if they’re not natural, to avoid waste and to make the most use of previously manufactured resources.