Undercoating is the first step towards painting a miniature. This is an essential step since the undercoat provides a smooth and even surface for you to paint on. Furthermore, a white primed surface will make the colours applied, look more illuminated.
There is an evergoing debate in the miniature painting society, on the colour of the undercoat. Our humble opinion is this: If your miniature has a lot of armour or other metal parts (more than 50% of the mini is covered in armour) then go for a black undercoat. In any other case, a white undercoat will provide a superior surface to paint.
Once your white undercoat is dry, you can shade it in order to make the details appear crispier by using a brownish shade. This method is the most recomended method by top ranking miniature painters. You can see the difference made by using this method in the next chapter: BASECOATING: 3. Undercoating examples.