Will acrylic paint stick to glass without base coating?

Yes, acrylic paint will stick to glass without a base coat. Glass is a non-porous surface, which means that it doesn't absorb the paint. Acrylic paint will adhere well to glass without any prior treatment. However, if you are painting a large area of glass, it's a good idea to sand the surface lightly with fine-grit sandpaper to create a better surface for the paint to bond to.