This mask can not only be used for a Darth Nihilus mask but also just a mask for Halloween.There are quite a few suplies and here they are.
-white spray paint-
-a bunch of cheap brushes-
Step 1: Paper mache
The first step is print off a pic. of the mask.Next what you want to do is take the tinfoil and press it up against your face as to make the shape of your face.Once you have done this carefully lay it on a flat surface with some paper towels beneath. Two or three should do the trick.Now either cut or tear strips of paper longways.Next start the make the paper mache mix.To do this mix the flour and water in a bowl by about one part flour two part water.Dip the strips of paper in this mix and lay them across the pressed tinfoil.After doing three or four layers of this let dry over night or pop it in the oven for a few minutes.The first part of the mask is done!
Step 2: Fiberglassing
Now the messy part.Lay the cloth that comes with the fiberglass kit over top the mask.Now apply the resin over top the cloth with a cheap brush.Let dry over night! Do not touch it or it will look weird and your finger will get stuck! This stuff is stronger than super glue so be careful!
Personaly i used nails to hold the mask in place so that it wouldn't change shape while drying but that is an optional step that you can take if you like.It just assures you that the mask will still fit you when your done.