not attacking Denny, so no need for defense, just pointing out there's inexpensive tools available to do the job
this is the cutter I use, actually a freebie from a local tool store, but the same as the original Olfas and quite rigid enough - cuts the 2" foam board [without any ridges] just fine with the right technique, always take at least 2 passes per cut, first one shallow - I like using a straight edge and happen to have an 8' x 2" piece of 1/4" steel a carpet layer gave me that works a treat for long cuts on any material - an electric kitchen knife as Dan suggests would do OK too, but because they're usually serrated or wavy edged, more chips
Bill
