So I have undercoated the Marder, first with Citadel Chaos Black, followed by Citadel Zandri Dust spray.
The road wheel tyres are Vallejo Black Grey. The helmets are Citadel Steel Legion Drab, the water bottles are Citadel Mournfang Brown. Though it is not really noticeable, the crate is Vallejo Old Wood.
The ammo box, two of the jerry cans, the jack and the locations of the Balkankreus identifiers are Citadel Mechanics Standard Grey. The two tarpaulins and the small pack are Citadel Death World Forest.
Tracks were painted a mix of Vallejo Black, Black Grey and Burnt Cadmium Red. A similar mix was used on the exhaust silencer.
The track was dry brushed with Citadel Mechanicus Standard Grey.
View of the gun.