Thanks again for the advice. The fellow represetning Zodiac (800 768 8883 & ask for Brick) described the repair process and advised on not attempting it as I could be doing the same with the sections of seams that now appear to be ok. He said that if I were to repair it, to use a 2 part MEK glue. Having just inflated and looked at it again, I have concluded that this is too ambitious for my skill set. Enough other things to do to bring my Columbia 8.3 back to the condition it was in when I bought it six years ago. Guess I'll keep on the lookout for a cheap used inflatible that is in better condition.
Since I just found this site, I expect that the subject may have been discussed before, but appreciate all of the input from you. I expect that a freind and I will be visiting here frequently for help.
We are on the Piankatank River off the Chesapeake Bay.
Thanks for all the help,