no hes askin what the bondo is for, the cheeks arent relly "sunk in" in most cases, layers of plastic are glued to the normally round helmet, makin it look sunk in, as for the bondo, well if you do that part then you have uneven edges for the cheecks, picture them like Steps... you layer them and its not smooth, the bondo is to fill in that, then sand down so the cheeks become smooth and flow and makes it look like one big piece.
