Has anyone used seam sealer where they join together or is there a better Idea! And how long could one expect the seam seal to stay intack and not shrink and crack?

Or how about METAL TO METAL body filler?

Welding seems to be a better answer....

What are you trying to accomplish? Keep water out or blend the seam?

Both, the water is the biggest but would like a lot less seam, doesnt matter if if is still defiend but!!!!!!!!!!!!