-Most paints are Polyurethane, which has a similar reflectance of plastic, plexiglass, and some glass. -This range in Hue/Saturate/Brightness is mostly between ~22% and ~24% or 25% brightness. In Hex, between 393939 and 3e3e3e. These are just gray colors, in gamma space. -You can add some color for a "colored" plastic…