Now we can add our crust. Take some of our 1-1/2 inch thick foam sheet and cut long strips that are about 5 inches tall. You'll need an electric turkey carver to really get this job done right. Then using some spray glue attach our foam crust to the outer edge of the cardboard. Spray adhesive is a contact glue, so you'll have to spray both the cardboard and the foam. Let it dry enough to get tacky, then stick it together.