Edge leading might dig in if the base is too soft - but other than that, I suspect you could get a good edge. When I first heard of lapping film, I bought a pack from 'bestsharpeningstones' which cost quite a bit. When I received the package, the film had a backing paper and it was self sticking - which was probably why it was so expensive compared to the non-backed paper. I used it that way (without pulling the backing paper which was fairly thick) and it worked fine. When I got the cheaper spread, I used my own backing paper for it for all the grit sizes. Again, it worked fine and the film 'darkened' much more evenly.
Originally Posted by honed
Inventor of the world's first safety vibrating Kamisori with night light. Go to http://badgerandblade.com/vb/showthread.php/299465-A-milder-Kamisori: Inventor of the Weckisori - (thanks sychodelix)