How You Can Use Sulfuric Acid To Sharpen Your Metal Files.

If there’s one thing that’s expected from a metal file, it’s that it will eventually get worn out and dull over time.  You could be thinking of using a sharpening steel, but a metal file isn’t a knife and would therefore need something much more effective.  If you can’t use your metal file as efficiently as before, chances are it could be dull and is already in need of a little sharpening.

This tutorial teaches you an easy way to sharpen your metal files using sulfuric acid.  Just be sure to wear protective gear, especially when handling the acid. 

Image source: Build Something Cool

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