@HJK, thank you for the kind words. I will try to list out my steps as best as possible, if you have any questions on steps that may be unclear, please feel free to ask.
1) all body parts are primered in AK Interactive surface primer - rust. It is a very runny primer so I usually do several light layers. No more than 3 so I don’t lose detail.
2) I take a sponge (I prefer the yellow ones you can get at craft stores) and cut off a chunk, and distress the edges to create a random edge. After doing that I apply a variety of AK or Mig paints via the sponge. I use these 3 most often it seems, but they make a ton as I’m sure you know. As they say, a dab will do you. Make sure your sponge is not too saturated, change up how you hold it and where the it makes contact with the model. You’ll want to take a picture of this to use in step 5.
3) Once that layer of paint has dried for a few days, give the model 2 light coats of hair spray and allow that to fully dry. Don’t worry if it goes on a little heavy, you can wipe it off and it will also evaporate a little bit. Cheap hairspray will work just as well as the high dollar stuff!
4) The hairspray should be dry after about an hour or so. Then you can paint the model/part your color of choice as you normally would. Or keep it lighter in some spots if you please to give it a faded look.
5) let the paint dry for a few hours (maybe more depending on your paint) and begin chipping away at the layer of paint you just applied. Reference the photo in step 2 to focus on chipping the paint off where the rust was created underneath. To chip paint, I recommend doing a YouTube search, or clicking Here. I use water when the paint is coming off easily, and thinner when it is putting up a fight. It really depends on the paint and cure time. You can accomplish chipping with a stiff brush, or a soft brush and cutting off the hairs almost down to the nub. Here is a brush that I use to do my work. It can be quite aggressive at times so be careful. You can go through the hairspray and primer if you’re too rough. Below is the brush I use:
6) After this I apply a variety of washes to the model. Rust streaks are accomplished by making vertical lines down the model with the rust enamel wash, and later blending them with white spirits. I watched This video to learn how to do this effect better. It is really handy. And if you goof it up, just wipe it up with some spirits and try again. You can put on the rust lines thick like in the video and “neck” them down to a smaller streak. For washes, I will liberally coat the model with track wash and let it sit to dry just a bit. Then I blend the wash better with enamel spirits, eliminating any brush marks along the way.