Last night when I was pulling maitenance on the new trailer and planning its future I noticed a, hopefully, minor problem. At the front and rear of the trailer bed forms a vertical lip about an inch high. The front and rear vertical panels are attached to this vertical lip by a stitch weld (1" of weld 6" gap between welds) the gaps "sealed" and the trailer painted. At some time about 8" of the "seal" failed and rust started. The plan is to have the inside of the trailer lined with LINE-X protective coating but right now I need advise on how to stop, kill, eliminate, destory the rust down in the gap between the lip and panel.