We understand your frustration. For best results, Rust-Oleum Specialty Glow in the Dark Spray Paint is recommended to be applied over a white or light-colored surface. It is highly recommended to prime the object with a white primer, such as the Rust-Oleum Painter's Touch Ultra Cover 2X White primer. The darker the object is, the less likely the object will glow in the dark. The closer, more direct, and more consistent the strength of the light is, the better the object will glow. Any shadows, blockage of light, or inconsistency of light during charging (i.e. gradual sunset) will affect the object's ability to glow.
https://www.homedepot.com/p/Rust-Oleum-Painter-s-Touch-2X-12-oz-Flat-White-Primer-General-Purpose-Spray-Paint-6-Pack-334019/307246404 - Rust-Oleum Product Support 5