Around 1972, I saw a classified ad for a partly completed canoe kit. The seller's son had started building the boat, but abandoned it before getting very far. Among the defects was a broken keel timber. I repaired the keel by sawing out the broken part and attaching two pieces of scrap lumber with carriage bolts. This repair shortened the canoe from 14 or 15 feet to 13 feet.
The boat had longitudinal stringers over frames. The stringers were supposed to be covered with canvas, then fiberglass applied over the canvas. When I got the kit, the canvas was missing. I decided it was superfluous and only skinned the boat in fiberglass, stretching it and stapling it in place over the stringers.
At that time I knew diddly squat about fiberglass, and of course the resin in the kit was polyester. My education was furthered when I began mixing polyester resin and hardener in a styrofoam cup. In seconds, the styrofoam dissolved and the resin splashed to the ground.
After mixing the resin in a proper container, I began applying it to the cloth. The weather was hot, the polyester set up immediately, and the cloth did not get saturated. The final result was a canoe with a fragile, brittle skin.
I went on a canoe outing with my dog, on the Potomac above Great Falls. I paddled upstream for a couple miles and all was well. When I came back downstream, the fragile fiberglass cracked and the canoe began leaking badly. I plugged the leak with my T-shirt and quickly returned to the boat launch.
The canoe didn't get used much after that incident. It ended its days chopped into pieces in a dumpster. Another one of them learning experiences........