inorganic metal coatings

Main difference is that organics tend to fade quicker. Dull finishes (like earthtones) tend to be inorganic. Bright-color finishes tend to be organic. For this reason, brighter paint colors are more often found on interior paint palettes.

I think it depends on the basic chemical composition, a zinc silicate coating thus is inorganic and an epoxy paint is organic.

Best regards