MX24 Glow in the Dark Photo Luminescent Strontium Aluminate Rare Earth Super Bright Water Based Acrylic Art Paint 1oz 2oz 4oz (White Glows AQUA, 1oz)

Bright sunlight for an hour, 1W 395nm, 5W 395nm and 10W 365nm UV flashlights, bright incandescent and LED lamps... nothing I tried was effective in coercing the multi-layer painted surfaces to glow longer than a few minutes. Depending on the charge duration with the UV lights, I could coax a dim glow for maybe an hour. It has to be black hole dark to see it.Strontium aluminate pigments are all the rage. What I read does not match what I see. Still looking for a product that will glow all night.