you'll want to drill the ends of the crack to stop the crack from growing further.
Caulk may be fine, I'm not sure what would adhere best to the material. Silicone caulk would probably be my first try, fill behind the crack as well.
just my 2 cents...
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2020 Four Winds 23U.. ex rental unit
2014 Jeep Wrangler 2dr Manual Trans toad
2019 Beta 500-RRS, for when the going gets nasty
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