Adherance problems to zinc chromate primer

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    The steam locomotive we are working on was primered 40 years ago with yellow zinc chromate primer, that has held to the metal very well. Subsequent coats of black, however, are not bonded to the primer well, flaking off easily in some areas, including the first coat of black applied in 1972. We are removing the loose black paint, but want to know if there should be a special treatment applied to the old primer before repainting with RustOleum black paint? Thanks.

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