I believe Zodiac makes PVC and Hypalon dinghies so you would need to get the exact model of yours to confirm. Should be a plate on the transom with model, SN, etc. that will help you determine.
Then you need to figure out where you are leaking. One small pinhole leak in the side of a tube would be an easy repair
, especially in Hypalon. Old tubes that are becoming generally porous or a bad seam not so easy.