Having put the Kil Kannon together I gave the model a white undercoat.
Like my Big Zzappa, I am thinking rather than a black basecoat (which is what I have used in the past on other similar weapons) I will use a basecoat of Boltgun Metal and then use washes and weathering powders.
See the workbench feature on the Forgeworld Ork KilKannon.
A great post – well written and beautifully illustrated. I look forward to seeing your painting.
Tony