From the manufacturer:
Create beautiful projects with this premium acrylic that will look great in daylight and glow color at night! This phosphorescent acrylic glows beyond your standard glow paint shining bright in the dark on a variety of surfaces. Tested for excellence on wood, walls, canvas, terra cotta, paper, Styrofoam(TM), or unglazed ceramics. Charge under sunlight or UV light to achieve glow effect. This package contains one 2oz bottle of Americana Glow-in-the-dark paint. Available in a variety of colors. Each sold separately. Made in USA.