Hey Rick, how's it going in Madison, I'm from LaCrosse. I painted a truck once that had bad surface rust on the cab corners and on the cab right above the windshield where the paint flaked off, so I sandblated the rusty spots and put POR-15 (black) on it, sanded smooth and primed and painted over it. It's only been about 3 years since I done this truck but it will be interesting to see if the rust ever comes back on those spots