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I use machinist tool black, heres a crummy pic of the horn bolt, works fine

Yeah, the tool black is the same stuff Eastwood sells and is not a zink phosphate coating . It does look OK but real zink phosphate is more of a flat greyish/black coating. Im actually working on a lot of GM (Oldsmobile)parts these days.

the bolt came out nice greyish/black compared to the horn bracket that is freashly painted satin black.