Having finished the undercoat on the Kil Krusha I started to paint it. I gave the internals of the turret a spray of battleship grey. I gave the main weapon a spray of grey.
It does need a second coat, but better two thin coats than one thick one!
I also sprayed the internals of the tank with the grey spray.
There was some overspray, but not a huge amount.
See the full workbench feature on the Ork Kil Krusha.