Hi my name is Tim , im part of a hobbyshop in Ft Myers Fl . It is a train shop but oddly enough i don't do trains . I build dioramas and compete in state wide contest . One of the old timers in the train store ask if I've ever built a craftsman kit . We started looking at FSM kits but when we came across Sierra West my eyes glazed over and i couldn't get my credit card out fast enough. I bought O Niels in ho scale and before it got to me i ordered the new foundry . Sorry for the long explanation but my question is why blacken the white metal and then paint , compared to black primer and paint ?