I’m guessing it’s a PVC type material
That’s major structural repair so I’d stick with a two-part for maximum strength
Poly Marine makes a respectable two part adhesive … make sure it is specifically for PVC and NOT for hypalon
The solvent for prepping the material and cleaning off spilled adhesive etc when finishing up the job is MEK (A methyl ethyl ketone —not acetone which is associated with hypalon repair)
Good luck
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