Thanks for your kind comment!
I am certainly not an expert,as this in only my second model model that I have done but this is what I did and it work for me to achieve the look that I wanted.
I used Testors enamel Flat rust for the base coat, I found out that by using flat enamel the brush marks or lines were greatly reduced specially if I applied the coat quite heavy. I then applied a coat of hair spray straight from the canister, after the hair spray dried I applied a coat of enamel Testors flat black for the top coat. I also used acrylic craft paint in various colors and Testors flat brown and even a little bit of rust powder to touch up here and there for the rust look.
This is the first model I did, but I did not use hair spray on the body, I just use fine sand paper to sand through the green paint until the rust shown through. the only part that I sprayed with hair spay was the bomb gas tank.