Nyah, Royalex canoes are easy to repair. Just sand off the outer vinyl layer–inside and out–then use boat-building epoxy (not hardware store stuff) to fill the crack. If the crack is small this is usually enough. If you’re a belt and suspenders person, epoxy a fiberglass patch over the crack on the inside of the hull. If you’re a security nutso add a second patch to the outside of the hull to cover the crack. When the epoxy is hard, sand the patches baby-bottom smooth–feather the edges–then spray paint them to match the hull. You’ll hardly know they are there. My Royalex canoes have been repaired this way many times–never a failure.
Cliff Jacobson