Fox: I had to section my running boards also and had a seam that I just could not get cleaned up to my satisfaction, so like Wanderwilly I went the Line-X route. After the the Line-x was applied I realized I didn't have to get the body work on that spot cleaned up as much as I did as that Line-x hides small mistakes. You'd never be able to tell that I took about 18" out of the running board in this spot.
Line-X hides imperfections And that stuff is tough as nails.
Regards, Dave