Mike said:
“The method that seems to be working pretty good on removing the paint and exposing the rust color goes something like this. First using a soft 1/2” inch brush dip it in the alcohol and put it on the area you want to weather. You have only one shot at getting it wet because if you go over it again you could remove too much top color where you really didn’t want to. Next I randomly make scratches with a toothpick . You have to apply feather light movements or again you might make the scratches too big. Then I take a 1" brush and stipple the whetted area using a strait up and down motion. I like to use a hairdrier when i’m doing this as the paint gets a rough , grainy feel and isn’t smooth anymore. "
I do like the results of the technique Mike.(https://www.largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-cool.gif)