As an optional but beneficial step, you may choose to cut a thin strip from your cardboard and attach it to the underside of the helmet, right beneath where your chin will be. Thi… See more

When it comes to attaching the lip to the bottom of the helmet, make a mark all along … See more

Place your helmet on the lip pieces where this line has been marked. Holding your helmet in place, tape it to the lip. Do NOT tape the lips together until both lip pieces have been … See more

Now for the foam. As you did with the cardboard, cut all your helmet pieces out of your foam. Using your spray adhesive, apply each foam piece to its corresponding piece on th… See more