Glow-in-the-dark paint can be purchased at most stores that sell other paint and paint supplies. Some of these stores include Home Depot, Lowes and Ace Hardware.
Rustoleum, a brand of paint found at many hardware stores, has available two kinds of glow-in-the-dark paint, offering a brush-on and an aerosol option that works either indoors or outdoors and requires natural or artificial light to charge the paint and make it glow. Wildfire also makes a luminescent paint that can be used outdoors; it is available from Amazon.com or other specialty sellers. Wildfire paint is normally used for theatrical and entertainment industries.