from thier web site
"Then we build boats with virtually indestructible seams, thanks to Thermobonding. This fuses the fabric together, as well as welding the inner and outer joining strips in a fully automated head fusion process. It totally eliminates the old-fashioned glueing method still used by some manufactueres.So it is very reliable. You can tell by the excellent finish."http://www.inflatableboats.net/bombard.htm
This link is broken, either the page no longer exists or there is some other issue like a typo.
call the number at the bottom and ask???