"Steve" wrote ...
Is there a way to protect rough, non-skid areas of fiberglass decks from
oxidation and UV?

We haven't used it (yet) but a lot of people in our marina and local sailing
club use Woody Wax. The results seem excellent. We plan on trying it this coming
season.

http://www.woody-wax.com/woody_wax.php

Fresh Breezes- Doug King