What paint?

I am in the process of replacing my thoroughly rusty chassis with a galvanized one. Does anyone have any advice as to which type of paint to use on all of the underbody components, suspension, axles etc? or should i just used bog-standard red oxide primer and hammerite? Also, is it worth treating the chassis with anything else, like waxoil, given that it will be galvanised.

Thanks.

why red oxide( if you can still get it ), AND hammerite? just bunk some hammerite on them