I spent some time over the last 2 weeks turning this HO BLI PRR M1b
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Into this
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Long story short, son "weathered" this locomotive (only 1 side), a few years ago. Been forgotten, son now in the military and dad wanted it restored for Christmas. A few hours, Q tips and 91% alcohol got 98% of the rust solution off, rest was taken care of with the airbrush.