Pinged an email to Boatworld. My one, "Air Deck 320" (in grey and red) has heat welded seams, they say.
Years ago I used to run a plastic welding shop in a factory for a couple of years . This was ultrasonic, not heat welding, and it was mostly solid clear styrenes, not soft stuff. So I'm hardly highly knowledgable, but the logic behind it in that place was - welding is cheaper and faster than glueing, with less fails. I wonder if that's true when making SIBs.
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