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Metal prep on a lathe

Q. I am removing paint prior to repainting an old lathe. The base material is cast iron. Many of the components have machined surfaces. For example the tailstock has a close fitting hole for its spindle. I am considering using one of the solutions generically referred to as 'metal prep' prior to priming. These generally leave a thin phosphate layer which inhibits rust. Will this layer interfere with the fit of mating parts such as spindles and bolts in threaded holes?

Malcolm M [surname deleted for privacy by Editor]
- Cleveland, Ohio
2002

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