Layering is another technique used to build light, shape and contrast. There is no single way to do it, but the general idea is to create layers of colour, light-to-dark, to create the colour transitions (gradient) on your model. Sort of the opposite of using darklining, that we discussed a few days ago.
You can layer dark to light, light to dark, or some combination thereof. It depends on preference and the requirements of your model. It involves multiple thin coats that get successively smaller and smaller in the surface area they cover to build up a smooth blend and rich color.
Layering is often achieved through glazing (we missed that one on “G” day because we spent so long on Games Workshop). Glazing is taking very thin, mostly transparent layers of paint to tint, add or change the colour underneath it. If used in successive layers on top of it each other, glazing can create excellent gradients to smooth out your colour transitions and add extra shape to your model.