What are some good ways to model it?? I know there is some stuff you can buy that you apply in stages to create the look of it…but is there a way to do it using household stuff?? I looked over a rust spot on my wife’s car to get an idea what I need-- I have some rust enamel paint-- but want to give it some texture. I was thinking of flour…but maybe that might end up becoming pasty? Any thoughts??
If you check this thread out, it should answer quite a few of your questions.
http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=5150
Excellent!!! Thanks man-- much appreciated! Guess I should’ve searched the other forums as well, eh? 
Another option can be found in this article: Creating realistic rust for dummies
Ciao
That’s a great link Fabio … thank you
You can also look in the same forum at the other …for dummies articles I wrote.
Ciao