Some general guidelines:
Floor coming PVC Inflatable Boats is a very
popular repair - Once the bottom starts coming unglued from the
tube it needs to be completely removes and reglued. This is very
time consuming because all the old glue must be removed, and
getting the bottom back in the right place is a technique
Small puncture or cut (less than 1/2" long -
can usually be easily repaired with a simple exterior patch.
Large cut, tear or mouse hole (over 1" in
length or diameter) - require both an internal and exterior
patch where the internal patch is for air retention, while the
exterior is for cover, and air retention.
Re-tubing an inflatable boat is quite expensive
- to the point where it is not really worth considering unless
the boat is 12' or longer