Yes, it’s like being in kindergarden again. There are many variations on how to apply the paper so use whatever method makes you happy and brings back play-time memories.
Here’s one method.

• Apply a thin coat of release agent to the face mould (petroleum jelly).
• Now we can build features (the new face) out of clay, moulding with hands and sometimes small tools for detailed work.
• When the face is moulded, we apply petroleum jelly to the still moist clay.
• Then we apply layers of papier mache.
• The paper I like to work with is thick brown paper with strong fibres.
• Crush and crumple the paper until it is malleable (soft) and will take form easily. Tear (never cut) different sized pieces.
• The mache I like is a mixture of white flour, white glue and water.
• Apply at least three layers allowing time to dry in between layers. (not essential to dry in between layers but it’s preferable).
• Once dry, use sandpaper to smooth face if desired. Easiest to do this when it is still on the mould.
• Remove the dry paper mask from the mould by turning it over and pulling or digging out the clay.
• Wipe off Vaseline from the inside. Here you may need to let the mask dry from the inside for a while. (wipe off the clay and rehydrate for further use)
• Cut eye holes, nose holes. For these holes, try to trim across the mask from the inside to make an even cut. Then do a more detailed cut with a scalpel knife.
• Trim edges. Do this by putting the mask on and looking in a mirror to see when each part of the mask fits the face properly. Trim a little and check again.
• Add fake features like teeth, eyes, lashes as well as screen to cover eye holes if necessary. Do this by using contact cement or hot glue.
• Note – if using table tennis balls for eyes, be careful the hot glue doesn’t melt the ball.
• Cut slits just above the ear level for the elastic band strap.
• Seal mask with glue. It is possible to use contact cement but best is a non-toxic, Latex based glue. The desire here is to seal with a rubbery coating so it is more moisture proof and flexible and looks more like skin. Use finger. It ruins brushes (this step is optional)