I have an old steel framing square that had alot of surface rust that made it difficult to read. I used a sanding block to to bring it down to a brushed steel surface. It is much improved, but I could be better if I could fill the etched markings with some sort of pigment. I tried a wide sharpie followed by a re-buff. That didn't appreciably darken the lines.
Has anyone ever had any success trying something similar?
Thanks,
Steve