If there was ever a craft made to be repaired, it was the wood and canvas canoe. Their tight canvas covering creates a smooth watertight surface that can easily be stripped and reapplied after decades of use. If stored properly the interior wood will last even longer then the canvas skin, but not to worry if yours has worn out or even broken a rib or plank. Once the canvas is removed the interior wood structure can be stripped of its broken parts and new planks or ribs can be shaped to fit, installed, and varnished for another half century or more of use.