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"You'd have to try it" is my only suggestion. Blacken-It seems to work on everything except aluminum, although the color varies a little. If the product has a good label, or one can find a manufacturer's website, it should tell what metals it's made for. But I've never tried any of them on rail, preferring to paint mine. If it's already laid, and it usually is, a brush and Floquil works fine for me. That's about the only place I brush paint with solvent paints anymore. The acrylics and latexes just don't seem to work well on rail. Maybe it's too oily...
The ME weathering solution works quite well for me, and it's definitely conductive. (I haven't noticed it being corrosive, but I don't have any definitive knowledge about that.) I use it to blacken points, frogs, and even copper-clad PC ties with no issues. You could try just dipping Unitrack in it wholesale and rinsing it off afterwards - the plastic should be unaffected. I get the best results if I wipe the rails with a rag or paper towel midway through the blackening (removing it from the solution to do so, of course).-GaryP.S. It is poisonous, so don't drink it.
P.S. It is poisonous, so don't drink it.