Hi Michael ,
Glad you liked the concept its so "simple" and easily made from an old eyepiece. Bought the luminous paint on eBay from an Australian supplier , it's acrylic based so dries quickly. It stays glowing for quite a while depending on how long it's exposed to light. Have used it on a round tray attachéd to my observatory pier. Looks a bit like the controls of the " Tardis" when you first turn the lights off.
Regards philip
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