The funny thing about make up is that after time and heat it starts to melt away. This can be very problematic for Zombies since there whole appearance is usually make up based. During breaks and downtime on the set of the Dawn of the Dead (1978) you wold see the make up artists roaming throw the throng of Zombies touching up the makeup as required. See other Zombie images on my commercial gallery by clicking here.

Zombie Touch Up