: Wood stained black is probably mold. UV damage usually turns everything
: white.

: Bill H.

I have a hunch that this kayak may have been built with redwood strips. Redwood is more prone to turning black than cedar is. I would still clean it well before reglassing.

It may be worth using a heat gun to remove all of the glass. If the damage is that extensive, it is probably better to do that instead of patching.