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Maybe CJ will chime in on this question.
He has painted a few Southern engines over the last few years.
With POLLY S gone, finding the correct shade may be difficult.
CJ hasn't posted here in a long while, however I feel pretty confident he'd recommend Scalecoat. That's what I'd recommend. Tru-Color will probably run a close second, but as I haven't tried that color from them I can't recommend it.