I use KBS 3-step system on all steel parts. Adheres amazingly.
Jan de Jong
>
> I found my steel pitch tube (the one that goes on the back of the
> cockpit module) has surface corrosion, mostly near the tab weld
> joints. I suspect the plating must have been stripped off during the
> welding process. The tube is dark brown, almost black, and I am unsure
> if that means it is zinc plated or something else. I was thinking of
> scrubbing the whole tube in alumiprep (dilute phosphoric acid) and
> then painting with zinc chromate primer. I don't have any experience
> working with this type of steel, and what effect if any phosphoric
> acid has, so I would appreciate any input on this.
>
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