I have been using jesmonite for mine. i am in the process of smoothing my helmet and have fibre glassed the arms. the jesmonite does add some weight but not a great deal it is actually the fibreglass that adds the most weight.
I posted on your page a while back asking if you could have a look at my armor. the helmet had some warping (my own fault) any way finished the peping for the remake could you have a look? http://www.facebook.com/media/set/?set=a.257889670908238.65274.100000616209740&type=1
dude i was wondering could you have a quik look at what i have done so far it's only low def but i think it's quite good and if you have any pointers or anything that would be excellent heres the link http://www.facebook.com/album.php?fbid=194864810544058&id=100000616209740&aid=45113&l=7b7a67272d
name: alex, aka aj
profession:N/A
Age: 14
Favourite hobby: armor building
Favourite part of halo: halo legends 'the package
Favourite video game: Halo: Reach
Favourite food: chiken tikka masala
Favourite finisher:??????
Favourite band: depends on my mood
Favourite movie: R.E.D