Isn't the (factory undecorated) shell already primed with something? Mine does not appear to have bare metal showing.
That would be very convenient! I just ordered an undec S2 from Brooklyn Locomotive Works, and I hope to get it Wednesday or Thursday. In the undec photo on the BLW site, the hood looks very much the same shade of gray as the plastic cab (very slight difference, to my eye).
It would save me at least $15, since I wouldn't have to buy Scalecoat MOW gray 1 oz ($4.95), plus thinner (another $4.95), plus shipping.
Hmm... that's money better
spent on buying bananas...