hi roger
i didnt have a rust issue..i had areas that had not been exposed to weather until water ran across or between them.this was mostly at panel overlaps where you can get into with anything but liquid..
i have been given instruction to spray a product in until it runs between the panels and the bare now surface rusty metal inside the car.its supposed to be the answer to the problem .i hear builders use liquid rust converter all the time for areas like this ..i had never heard any builder speak of using a rust converter for areas they cant get to any other way.
ill try it .....maybe ill look like an ass again.....
tom