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You dont by chance have a reference to Jim's article do you? Be interested to have a read, 954C is pretty HOT!.Last place I worked we ran 100 bar steam at 525 C so Like Dave said, you paint wont last long!
It was originally a paper read to The SMEE, and later published in Model Engineer, March-April 1966 (which is the year before my library starts), but also reported in 'Model Locomotive Boilers: their design and construction' by Martin Evans, MAP, 1969.