I use a flat bastard file to clean up the edges of mine.
Makes them perfectly smooth and cuts fast too. Maybe a little too fast if you don't watch out! (Note, I've only done this for FR4, might be a bit risky for the other types, not sure)
Makes a lot of dust, so keep your mask and vacuum handy...
--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
>
> I usually sand the edges just to get them smooth, but here's a photo of
> some of the trimming still under the 12" shear:
>
> http://www.delorie.com/pcb/tmp/grizzly-shear.html
>