Foam board is one of my favorite art supplies. I craft large 'reverse' sculptures with foam board. It can be frustrating and almost impossible to get curves to cut perfectly. After cutting out a 5 foot Christmas Angel, I was playing around with my craft tools and stumbled on a incredibly easy method to cut the Foam Board, almost perfectly!
1. Using a craft knife, cut around the pattern piercing only the top layer of paper. Always use a sharp blade!
2. Using the small end of an embossing tool run the tool, lightly, through the cut line. Go easy. If the Stryofoam pulls, at all, you are going too deep.
3. Using your craft knife, make a second cut down to the paper. Then, a third cut through the paper back.
I have tried all types of foam board cutting gadgets. This is the easiest and best method I have ever used. I will be using foam board even more in future projects.