I went ahead and bought some of that composi stuff for myself in that video I linked above.
Here is my first attempt at recreating Kanohi with the stuff:
First attempt? It's awful, I know. The middle is so funky because that's where I cut the mold. Bad mistake. Post your reaction gifs if you want, but you won't be contributing to any conversation with them.
The material used is very malleable, even after solidifying. It's about as malleable as a piraka spine, and given how thin the mask is, it's very fragile.
Anyways, I thought this was worth posting, so I'm here, for all those curious about getting that composi stuff for yourself.
If I can improve and make any parts that're superior to this, I'll be sure to post them here.
I'm gonna start calling these Synthetic Kanohi, because it sounds cool and edgy.