Global Scale Modeller

I'm building a ww2 luftwaffe airplane kit and wondering what the purpose of RLM02 is for in paining the kiy

RLM02 is just one of the colours used on Luftwaffe aircaft, in cockpits, landing gear, wheel bays and other compartments of the aircraft. its like any other aircraft. The RAF, USAAF, Soviet aircraft, Luftwaffe and every other country had their own colours.