Purple Glow in the Dark Paint 2 Fluid Oz. Highest Grade Strontium Aluminate Pigments (grade 0, Brightness Rating 33000 mcd/m2) Apply very thick, 1/16" or 4 oz per square foot. This container covers 18 square inches or 0.125 square feet. Ideal to paint abusive environments like glow in the dark fishing lures, metal surfaces or signs Often used for star ceilings, starscapes, and other space murals Glows approximately two hours after full charge, can be recharged millions of times