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? I greatly appreciate any and all feedback to be had on this question. Dirty jokes notwithstanding.