As long as they are clean, epoxy primer should stick. Of course the smoother the finish on the part, the less surface primer has to grip on. I would not rough up a zinc finish though. Zinc is a rust inhibitor and is only a few thousandths thick at most.0005-.0025. Clean the plated parts with wax and grease remover or lacquer thinner, let them dry and prime with a good two part epoxy primer.
If your problem is paint coming off when you try to turn them with a wrench... you need better wrenches with proper flank drive and you should try to install that hardware before final painting. Go back and use an air brush to paint them after installation (mask where you don"t want paint).
One thing to keep in mine too is how your tractor was originally painted and assembled. 9 out of 10 tractors have been repainted at one time or another, so it"s hard to tell what was originally painted and not. So many people paint over hardware becuase that"s what they remember seeing. The truth is that they have seen them painted over many times, but probably mostly repaints. It creates a lot of confusion. Thnk about it this way, if you are managing an assembly line, most parts are going to be painted off line and supplied to the line. Therefore those parts will end up being installed with plated not painted hardware. You don"t think they are going to individually paint bolts do you? It"s not real practical unless it"s part of a sub assembly. They also wouldn"t paint a bolt and then try to install it as it would then surely mess up that paint on the bolt. Sure a certian portion of the tractor will be assembled and then that section painted. Like the rear end, transmission, hydraulic section, engine and maybe a few brackets will be assembled and then painted as a unit. A bunch of parts will not though, because it would be too difficult to paint if too many parts were in the way. My point is that you have to be very careful about what you think is correct and question it if it doesn"t make sense. Just cause you saw 10 tractors with certain bolts painted over doesn"t mean it"s correct.

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