Thanos was tempted into a life of destruction and death, but cosplayer McNopants13 didn’t have to replicate his path when he made a mask of the villain’s face and constructed his Infinity Gauntlet. Building this costume requires a little background knowledge in casting a bust and hand to use as a base but if you can figure that out with online tutorials or workshops, you can move forward. He used medium chavant clay to sculpt and then put the sculpts in molds:
for both moulds i used the same technique which consists of building up a wall of clay and then adding a good coverage of a cement like substance called ultra cal. this product is ideal for making masks out of latex and foam latex
make sure that you cover your clay in a good clear coat spray before you apply the ultra cal this makes it alot easier to clean out the clay later.
once the clay is out and the moulds are clean you can begin your casting in latex or foam latex when using foam latex it is also wise to reinforce the inside by laying some sort of stretchy mesh or pantyhose on the base
More details at the below link.