You know about ArmorAll? AVOID IT and all other similar products. In fact it almost sounds like that is what happened to the Zodiac. Those silicone based compounds will attack the seam glue on older inflatables.
I have a similar '93 Achilles still giving good service. One year in winter storage in my garage some mice made a nest in it. Ate a fist sized hole in a tube. A professionally applied patch has permanently fixed it.