i used a few good layers of the mache mix. my mix was almost a 4 ounce thing of basic white glue like elmers and bout half cup of water and kept making it thicker after each layer dried.
then spray painted it. http://405th.com/forums/index.php?act=findpost&pid=69233
the link to my helm page. i didnt use alot of mache layers for rounded edges since its just a display piece.