Fender Sealing

What Plymouth used in 67 was a white foam tape/weather strip. Pretty much the same material they used at brake backing plates, master cylinder, bumper brackets, etc..., but 1/8 X 1 adhesive backed. I know they went to a extruded bead of caulk in later models. Whats best? Danged if I know. It could be that nothing at all is best. That's what we find, or should I say don't find, in more modern builds.