I have been experimenting quite a bit on the below Chimera. Many firsts, including working with resin, oil paints, weathering powders, and airbrushing. So far I was quite happy with the model, up until I made an attempt at rust effects.
I have been using the Imperial Armor Masterclass books as a guide for techniques, but I have to say, I am not happy with how my rust turned out. It just looks like random brown/orange dirt flicked throughout the model. My rust mix consisted of burnt umber oil paint, brown rust weathering powder, and white spirit. I then airbrushed white spirit over the rust to try and create a diffused and blended effect. However, I believe my oils managed to dry a bit too fast because I used too much spirit in my rust mix, so the airbrushing did little to nothing to the rust on my model.
How do many of you add rust to your vehicles? I am looking for a more realistic/military modelling effect. I have found many guides on how to paint rust on things like body armor/chainmail and tank treads, but not vehicles themselves. If you have any pics or tutorials, they would be appreciated
If you guys could please provide some constructive criticism, it would be most welcome. Please excuse the picture quality, I did the best I could with my phone

Also, I know there are gaping holes in my Chimera track guards, as I was a little overzealous while sanding and soaking them in hot water to get them to fit. I was thinking about hiding them with camo netting, but that's another experiment for later.