Smaller holes
On smaller holes and repairs I have always found a hot glue gun works great. The tip of the glue gun melts the plastic a bit and helps the glue bond. Inside the hull the glue will mushroom which helps holding it in and after its dry you can trim the glue flush with the outside of the hull and barely tell there is a repair. I've never had one of these plugs fail and just plain hot glue sticks work well.
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