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I painted the interior with a heavy dose of black wash to make it look extra dark and oiled ... you can see some brush strokes but when the pieces are put together, looking in through the doors or hatches it isn’t noticeable and I’m very happy with it ... but now I have moved to painting the exterior.

This is what I have so far





So far I have primed then red airbrush coated the sides which the next step would be to clear coat which helps put a nice finish on the red then an oil based wash. However I am concerned with the large flat surface areas the oil wash alone may not give adequate weathering appearance for a chaos vehicle. And I don’t think using black wash before clear coat would look quite right either?

Next thing is I was going to keep the top panel black. Paint silver wash it then clear coat then wash again and rehighlight and work metals basically same as above. But I’m thinking maybe I should add some scratches and armor damage to break up the solid black ?

Does anyone have a good tutorial video or website that covers these topics please?

The wash will help to dirty it up somewhat, but doesn't do much for actual weathering. I would recommend adding some chipping - given that you have already painted the red on, sponge weathering is your best bet. Here's a handy tutorial!

You can also drybrush brown or black into the creases to help dirty things up a bit more.

Yes, wash wont do mutch for flat panels. you need to do it the hard(and over time, fun) way, aka paint damage, if you are not doing traditional layer highlights, or edge highlights.

Scratches can be done whit the smalles brush you have plus in this case a metal colour. no need for steady hands, cuz damage aint perfeckt.
Then i would grab a dark brown and as insaniak said, lightly apply it on a bit of sponge and lightly dab the model with it. For futher effect, you can use various shades of brown oil paint and do streaks/ add deapth to the metal scratches.

2 things to keep in mind: a; apply a clearcoat before each stage, else you will ruin the paintjob. oilpaint use thinner and thinner just rubs of the paint very easily. b: it is very easy to overdo it if you use more then 1 style of weathering to the point where it looks just wrong.

https://www.youtube.com/watch?v=aNBeRdi_cf8

Sponge chipping and oil/enamel streaks on non horizontal surfaces. You can also use a pencil on hard edges for a nice effect.

Scrape up some pencil graphite and rub it around surfaces that need wear (hatches, access ramps, ladders etc) using your fingertip.

Weathering powders. In the track sections, and around the bottom for dirt. You could use soot powders around exhausts also.

I'll second the sponge recommendation... use natural sponges if you can. Unlike other techniques (salt chipping, etc) the skill curve is pretty reasonable and you can easily do a quick test piece.