The dremel tool worked well for me, but what ever powertool you use to cut it will also melt the plastic. You must cut out small pieces at a time or the plastic will melt behind the cut and seal it ...

The Dremel rotary tool is an extremely effective device that is defined by its accessories. If you're short on cash and just need to cut a basic groove, use this hack to make a simple router ...

Are you using the standard little red disks, the fiberglass reinforced, or the metal? I think they're all called "reinforced". It does take some practice to not waste disks, the first time I tried ...