Step 2: The TP stage
Next comes the toilet paper or "TP". What is so amazing is that you can make a lot of different skin effects with just TP and liquid latex. For this particular zombie I made the cheeks look all wrinkly and dead, and (as you'll see below) an open gash on his forehead. But you can do a lot more by just playing with these two elements. The more you add to you subjects face the more you have to play with and make gross looking.
For the gross looking cheeks I put a single layer of TP on each cheek, then using a liberal amount of liquid latex I sealed them to my actor's face. Allow to dry.