Step 1: Materials
Plaster cloth roll
Step 2: Making the Plaster Mask
Make sure you have a pile of plaster already cut into strips at the ready. Size doesn't matter than much, but strips that are around two inches wide and three inches long are manageable.
Begin by dipping small pieces of toilet paper into the water and laying them over your volunteer's face. Make sure you cover the entire face, making the toilet paper about four-five sheets thick all around. This way is less precise than slathering the face in Vaseline, but it's a lot cleaner and has less of a risk of the plaster sticking to the face.
Step 3: Using the Plaster
Dip the strips in your water and run your fingers together over the strip to make sure it's not too wet.
Apply the strips all over the face, using fingers to blend edges together.
You can apply as many layers as you want, but just make sure the mask is at least three layers thick, or it will likely break once dried.
Step 4: De-Masking
I know, exciting.
Give it the night to dry.
Once it's dry, you can pull the toilet paper off from the back.
Step 5: Adding Aluminum Foil
Cover the mask in glue and use the brush to spread it out and then add strips of foil, smoothing them over the surface. Paint over the edges so they stay down. It'll dry clear.
Step 6: Adding Whatever You Want
However, if you want to have fun decorating, go ahead.
I painted on some teeth to make it look creepier.
You can also find loose wire and glue that all over the mask to add to the robot-ness.
Step 7: Making Straps
Cut two long strips of duct tape and fold them in so that you have a strip of double-sided tape.
Make sure to leave a piece of the sticky side remaining on the end of one strip.
Then staple the strips to the inside of the mask, one on each side.
This way, when you put the mask on, you can pull the strips back and they're stick.
It's pretty easy to take on and off.
Step 8: Scare People
(making a robot warrior helmet out of cardboard is optional)