Once you've got the patch in place close off the interior of the boat and
put an electric heater in there overnight to cure the resin, whichever kind
you use. The only problem I think you may have is keeping the resin from
running until it cures. Sticking plastic sheeting to the exposed resin, or
thickening the resin will filler might help. The suggestion of doing a
test inside the boat is a good one.