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Jim, Zodiac has had problems in the past. With their older construction and glued seams, the glue degraded with time and the French government required their rafts to be condemned after 10 years. Zodiac will not repack or service life rafts more than 10 years old as a result of that policy--and their inflatables can't be built any better than life rafts.
So, caveat emptor.
Whether you have PCV or Hypalon, there are specific adhesives and primers to be used with each, made by Bostik and other companies. Anyplace that sells inflatables should be able to sell you the right primer and adhesive (usually as kits) but if you contact the vendors directly, you can usually avoid the "marine" prices. These are just industrial adhesives, nothing specially "marine" about them.
Proper surface cleaning and preparation are essential, follow the instructions and when the expiration date comes, throw out what's left. Usually, once you have a lot of seams letting go...all you can do is chase them until the problem gets too big and you have to get rid of it.