Everything that is going to be coloured in a skin tone - except for the edges - must be pre-coloured slightly with red to suggest naturally perfused skin. To do this, apply Grimas Special Effects Powder 504 or a red Grimas Eyeshadow/Rouge using a Make-up Sponge or Powder Rouge Brush.
Then use a sponge to apply a covering layer of Grimas Camouflage Make-up Pure in the desired skin shade.