Birth of a 1970 Dart Convertible

I'm thinking of getting some more coating I sprayed the underbody with and do the trunk, they make in tintable. The trunk seams like the first place to get all beat up. It costs about $ 100 a gallon. Does anybody know why mopar used so much seam sealer? Was it to cover the welds? There was alot of sharp spot welds that I have cleaned up. Sorry no pictures today. Thanks for all the good coments......:glasses7:
Jim