Have you tried hardwearing enamel paints (Humbrol) - none that 'glow' as such, that I know of, but there are certainly metallic colours which will be shiny. Silver may work for you: http://www.humbrol.com/paints/paints-by-finish/metallic-colours/aq0126-11-silver-50ml-metallic-enamel-tinlet/