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Aurora & Portland Owner
I always do my undersides. First I spray grimy black, then rust. I do them pretty much the same as I do the trucks. An example of a caboose and a flat car.

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Well-Known Member
While I have weathered a few on the bottom, it's not a standard procedure for me. I have mainly done it on old Roundhouse cars with metal floors. I do weather many air brake reservoirs that can be seen from the side.

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