That boat is probably well past its lifetime, assuming it is PVC. How is the glue holding up? Have you used a soapy water solution to check for leaks yet? JKY's suggestion of a garden sprayer is a good one for quantity of liquid. The valves all will leak a little with the caps off. The caps are what seal them. Are the cap o-rings/seals leaking? Are the o-rings from the boat to the outside valve leaking for the speed tubes and the keel? The valves all unscrew and no glue is needed for replacement.
The glue needed is a two part glue. Stabond is one brand and Clifton is another. Any patch material will need to be the same as the boat. IE: Hypalon, or PVC.
FWIW I have the same boat but a 1993 and it has needed everything reglued. More work than most people would be willing to undertake. My point is stop and think before putting any time or money into the boat. That doesn't mean it can't be fixed, just make sure it is the right thing for "you" to do.