No, I'm not talking about specifics of the "Spanish style" (Mig Jimenez and Co.) which, at least as far as I could guess, assumes that the more of different "effects" you put on the model the better (and more "realistic") it should become.
I just wanted to understand why so many of our fellow modelers think that paint chips always cause rust streaks on a typical AFV.
I personally saw a lot of real tanks and halftracks exposed to some severe weathering, I have studied lots of archive photos - and my personal experience was that armor steel does not get rusted easily.
The last example that I could see was about a year ago - when in the Armed Forces Museum in Moscow, Russia several tanks had their bare metal armor fully exposed (all paint and underlying primer coats were completely removed during the restoration work) to rains, etc. for over a month - and there was nothing near to what we could see leaking from under those tiny paint chips on many models
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