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As I investigate this question, I have learned that many boats have this filler material in seams, some call it a "welt" or "welting", and that it was, in at least some instances, made by Goodyear. Those familiar with boot-making may smile at this, remembering that one method of affixing uppers...

Sorry, no pics. Boat is not at the house right now.

I checked the boat again today. There is an obvious material or "welt" as some say, between the layers of aluminum at every seam. What it is made of, I do not know (thus I don't know if it shrinks and swells at all. Anyone?

Well, I don't know what it is or if it's on every seam on every boat. There certainly is on this mirrocraft where the two sides of the bottom sheet form the bow and are jointed by a very heavy "stem" piece of aluminum. At least where the laps trakes are, it would seem essential. I don't...

There is that (usually black) material along major rivetted seams in most aluminum boats. In older boats, to what degree does that shrink when dry for a long time and swell shut when placed in the water. It seems I've noticed a bit of that temporary leaking in one of my old boats, all of which...