I think I am going to clean the metal with POR'S Metal Clean and coat the outside welded area on the back panel & inside the drip rail with POR-15, let it set for a week then seam seal the drip rail and skim coat the back panel with my regular plastic filler, prime & paint over it with the urethane single stage I bought a few months ago.

1957 Chevrolet 1/2-ton Stepside LB in the Gallery
My Photobucket shots

The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself." - John Stuart Mill (1806 - 1873)