Up to weathering and here's how it looks....
I used the stuff shown here for the weathering process...
I like water colours because if I stuff up I can just wash it off and try again. I mix the water colour with some washing liquid and a little water.
I move the "oil" stains aft using quick strokes with the cotton buds or my finger. If you want to move it after the colour has started to dry, make sure you use a damp cotton bud/finger.
The pink pencil is a water colour pencil. I used this to create the "Aflock" stain coming from the snuffleupugus tube. This stuff is an anti-corrosive used in the ECS of the F-111.
I coloured in the area I wanted pink, then dabbed it with a wet paint brushand allowed the water to wet the paint. This smoothed out the colour instead of it looking like a pencil.
This only works with actual water colour pencils, not your regular colouring pencils. Don't make that mistake!!

Here's the outcome of all the water colour weathering..

This is what the real thing looks like...

Here's some PROPER oil staining!!
Thanks for looking!!