The underside is done in Fortress Grey equivalent with white sponged on in a random pattern - this does not show very well in the photos so well spotted
I use various spray cans for the larger surfaces with the Mask FX system for the splinter camouflage
Car Primer light grey
Army Painter Angel Green and Goblin Green
Tamiya NATO Brown
The remainder is brush work with Army Painter Matt Varnish to seal and dull it after the decals but before the weathering.
I have used a mixture of GW and Vallejo paints... I prefair Vallejo as it is cheaper, comes in a larger volume eye dropper bottle for control and has good coverage and I am slowly phasing out the GW paint.
The weathering was done using Burnt Umber oil paint.