It's entirely possible to paint on glass using regular acrylic paint, but for best results, you need to seal the paint on the glass. There are two ways to do so, and both are quite straightforward. One uses a spray-on or brush-on sealant; the other uses a home oven to bake the painted glass item.
Painting Glass 101: Your Complete Guide - Mod Podge Rocks
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Mod Podge Spray Acrylic Sealer that is Specifically Formulated to Seal Craft Projects, Dries Crystal Clear is Non-Yellowing No-Run and Quick Drying
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