This pdf file from Wilderness Systems describes repair methods for rotomolded polyethylene boats.
Applying a cloth patch (using either fiberglass or aramid) with G Flex on the interior of an area of severe damage is certainly an option worth considering. In order to do so you have to be able to access the interior of the boat at that location, not only well enough to apply the cloth and epoxy, but also well enough to pretreat the polyethylene by flaming the surface with a propane torch. If you don't do this, G Flex will not bond satisfactorily.
Hardshell Kayak Sail Rigs
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