I've read several posts here and elsewhere about using Quick Epoxy, with window screens, wood, sawdust, etc for quick on-river repairs.
Most of the manufacturers who have some type of 5 minute epoxy say their stuff is water resistant, not waterproof, and recommend not using is for below waterline repairs.
Assuming this is just to get you off the river and fix it back in your shop, good enough for a 2-3 week Grand trip if you're so unlucky to ding your boat the first day?