Old Town Canoe according to the following link. http://www.oldtowncanoe.com/craftsmanship/heritage/Who first thought to use it (royalex) in canoes?
"After a strong run as the largest canoe manufacturer in the world, Old Town made its first kayak in 1940. By 1970 Old Town had won national awards for material innovation with its fiberglass boats and was the exclusive manufacturer of canoes and kayaks to the US Team. Since then, Old Town has helped reshape the canoe and kayak industry by being the first to bring Royalex® and rotomolded plastic boats to market."