Anyone have experience in fixing door seam rust? On my 2013 F150 the rear door has the lower 4 inches of the outside seam a little rusty and I know it will spread.

I can sandblast the surface, but does anyone have a product or experience in a method to remove it from the seam or am I SOL?

I am almost to the point (if you see my TSB thread) to trade this truck in on a 17' 5.0L XLT Super Crew and lease it. If so I need to fix or cover this rust up...