How do I finish an acrylic painting with medium?

To finish an acrylic painting with medium, first select an appropriate acrylic medium based on your desired effect, such as gloss, matte, or satin. Once your painting is dry, apply the medium with a clean brush, using smooth, even strokes to avoid streaks. Allow the medium to dry completely, which can enhance colors and add depth. Finally, consider applying a varnish for added protection and to unify the finish.