Just got back from the Hardware store and I got my pink foam sheet for tombstones. The thing i noticed when i got it home was that there were what looked like "score" lines. Should I be worried that the foam will snap? Do I need to cover them with something like monster mud?
Thanks!

(here a picture of what i mean)

http://i937.photobucket.com/albums/a...s/GEDC1767.jpg