Find out what the maker and model of the boat is. You are probably talking about a polyethylene kayak but there are different types of polyethylene and repair methods differ.
Most polyethylene kayaks are solid (1 layer) rotomolded polyethylene. Most makers these days use some variant of linear polyethylene, but in prior days some used cross-linked polyethylene and some still do. There is also three layer rotomolded polyethylene which has a foam-like core between two thin solid layers.
Thermal welding works well for solid linear polyethylene boats but may not work as well for three layer polyethylene boats and probably won't work at all for cross-linked polyethylene.
Cross-linked or three layer polyethylene boats can be repaired using West Systems G Flex epoxy, but the surface must be thoroughly cleaned, then pretreated by flaming with an inexpensive propane torch. It is also best to use some type of cloth (like fiberglass) when repairing through and through cracks in poly boats with G Flex.
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