Varnish question for a fredn

So, here's a question my canoeing crazy friend asked of me..I made myself a mahogany and basswood canoe paddle, and it's beautiful but I wish to make it watertight, and "you seem to be the most wise experts on wood often exposed to water" and so I wish to ask you what is the best varnish for making it watertight in perpetuity? :confused: I greatly appreciate any and all feedback to be had on this question. Dirty jokes notwithstanding.

You can try this product it works pretty well as far as keeping wood waterproof.

Minwax® Helmsman® Spar Urethane - Oil-Based Clear Protective Finishes - Minwax.com

+1 on the helmsman poly. Use that or a 2 part epoxy based finish.

Unless it's submerged all the time, there are a number of other finishes that would be okay as well.

thanks to all, I really appreciate the helpful responses.