Sounds exactly how the cars here in the UK rust. Window frames leak first and the rest just follows from there. Door bottoms, rocker panels, wheel arches, all very familiar stuff. I picked up some red primer today, i usually use grey. I also picked up a very nice shade of green that was on sale called Highland Green. I've never done weathering before so tips and pointers are more than welcome. I won't be going wild like ripping into wheel arches to simulate rot cos I don't want to risk ruining it, it'll be more a faded patchy repairs early 80's second hand car look. I've seen rock salt being used to simulate chipped paint but not sure how it would take to automotive paints. Anyway, hints and tips are very welcome:)