I bought a four sided paddle with no surfaces finished. I glued two strips of balsa to opposing surfaces, and sanded them smooth and flat with wet or dry. Applied two kinds of ChromOx. It works very well, but even four extremely light laps is too much for me. Just too harsh an edge. I like shaving off natural stones much better...

A friend told me a long time ago about chasing the wrong side of sharp, and for my skin, he was quite right. I like sharp, but I like smooth better!