Cathy, look for glow in the dark egress marking tape. It glows 12+ or 24+ hours on a 30 minute light charge. The technology is used for power failure exit path marking all over the world now. The active ingredient is Strontium Aluminate. You can also look for high concentration Strontium Aluminate paints, but most are water based. However, you can also buy Strontium Aluminate powder and use it to dope white oil based or enamel based paints, or dope clear nail polish. Check Amazon and eBay for highly rated products and sellers.