Glo-Kote is a ready-mix,  1/8-in. concrete resurfacer that glows in the dark. The cementitious, photoluminiscent material is charged by ultraviolet rays during daylight hours and casts a reflective glow at night. Two hrs. of direct sunlight exposure typically yields reflection of eight to 12 hrs. The product’s special nonradioactive aggregate polymers may cause lead times to extend. Super-Krete International Inc. 800-995-1716.