Here are the oils i will use to add streaks and rust stains to the container.
First up I ignore the rusty patches and apply oil dots of colours complimentary to the grey of the container. In this case blue, white and grey. On the sides of the container they are dragged vertically down with a flat brush damped in turpentine, while on the roof each dot is blended into small patches. the whole process is kept subtle with most of the oils removed, leaving just a hint of colour. This adds nice tonal variation to what is a fairly monotone structure.
A similar process is then begun, but this time with the rusty colours. Large areas around the rust patches are stained with yellow and orange oils while the stronger redder colours are used with more intensity over the previously painted rust patches.
The scratches have oil applied along their length which is then dragged down producing lovely rusty looking streaks.
The same process is applied to the doors. references show that these streaks always seem to originate from joins or where one part bolts over another so i followed a similar process.
Not shown, the previously constructed pallets of water and drinks were glued into position with Gator Glue before the doors were fixed in position.
Ready to be installed on the diorama base, the container will need some dust applied in the form of pigment weathering but i will do that once its on the base thus ensuring everything ties together nicely.
Detail shots of the completed container