Sand paper and a standard 12" ruler for sharpening machetes

[9blades]

I've been catching up on yard work today. A little while ago I grabbed a kershaw camp 14 from BHQ for the wild jungle, also known as my yard....The factory edge was passable but bleh. I don't have any stones big enough to handle it so I took a piece of sand paper, ripped it lengthwise into three strips and folded it around a 12" steel ruler. Held in place with my fingers it worked great, I used a single strip of 600 grit wet/dry and a little water. It shaves hair with a little pressure, which is fine for the yard work I'm doing. Has anyone else tried this before?