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After finding a rusted old Starrett ruler in a ‘Free stuff’ pile left by a neighbor, I decided to restore it and repaint its notches.
First I placed it in a tray and covered it with vinegar (20% concentration) for an hour or so. Then I scraped the ruler with a bread clip and 1000 grit wet-dry sandpaper to polish the surface. After washing and neutralizing the vinegar, I cleaned the steel with alcohol and was ready to restore the black paint in the notches.
I used an oil-based black paint that I had, but acrylic paint could work to. Find a paint with a high concentration of pigment or go ahead and mix into your paint more pigment to increase visibility to the notches. I used a rubber applicator to pull the paint down the ruler. A cutoff from a car’s windshield wiper blade would be good too.
Clean any spillover with a lint free cloth slightly moistened with mineral spirit (for oil paint) or water (for acrylic). After the paint dry, polish the ruler with 1000grit wet-dry sandpaper and apply a thin layer of wax on your tool.