I just added a boat rack to the top of my TC to haul my canoe. The canoe is presently sitting on it. Sure nice to have it out of the garage. It is one of those green Old Towns. Will it hurt anyt...
Not on a roof but our green Royalex Old Town Canoe has been stored outside in Wisconsin weather for almost 20 years. Its dull but still looks good . Quick sand and vanish to wood about every 7 years.
From hard use we get a lot of deep rock scars in the Royalex, after a few years in sun and weather the scars pretty much disappear.