I started to paint two of my HQs. Both are from the MKIV Command Set from Forgeworld.
I started with a foundation of Mechanicus Standard Grey. Afterwards I used Ulthuan Grey. The grey colors makes it easier for the white to shine. With only the white on the black primer I always have black spots in the white. The next steps are about four thin layers of Ceramite White followed by thre thin layers of White Scar.