Reddit reviews USC Premium Fiberglass Cloth & Resin Repair Kit
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Available in quart kit with fiberglass mat or clothIncludes resin, hardener, spreader, mat or cloth and illustrated instructionsFast curing and tack freeWaterproof and impact resistant
You can try to fill and patch both inside and put with a fiberglass resin like they make skin on frames or with boat making in general. The fiberglass acts similar to the plastic and the resin will fill the crack and adhere to the fiberglass to hold in place. Light sanding especially around the edges will help with it not catching on things. If you really want to use plastic though, you can sand the inside and out then apply the plastic, but i haven't had luck with it since it doesn't seem to seep into the crack like resin does.
Source: fixed hairline cracks and pin holes in kayaks.
https://www.amazon.com/Premium-Fiberglass-Cloth-Resin-Repair/dp/B003KT5LZM
Something like this should do. You can also piece meal a kit from several sources, but this just happens to be all in one. It will last awhile with proper storage.