If you have other work to do like glassing or bottom coating, then just get a small kit of epoxy and a bag of filler. You mix the filler in with the epoxy to make a glue/putty, i would used wood flour for this, its thixotropic (non sagging), strong as heck, and not expensive.
If this is the only use you have then just get a small kit of pre-mixed putty
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