Here's the response I got from Cataract. Very quickly, sent Saturday, rec'd this AM.
"Thanks for the inquiry. There's a quick, good fix to maintain the surface on the fiberglass oars and it involves a can of Minwax Helmsman Spar Urethane (Clear Gloss). You can typically get this in an 11.5 oz. spray can from Lowe's or Home Depot. If you rough up the surface of the oars with a Scotch-brite pad first and apply 3 coats (and follow the cure instructions between coats) you'll get excellent coverage over the surface. A big thing to maintaining the oars is to ensure that they're covered and out of the weather when not in use. UV exposure with fiberglass products (and a lot of other materials) is going to affect the surface over the long haul.
Once you restore the coating you might want to consider 303 Protectant. Here's a short description:
"303 Aerospace Protectant - Pump--SPF 40 Sunscreen For Your Stuff!™This is the maintenance product manufacturers recommend most. Only ‘303' beautifies as intensely, protects as powerfully or lasts as long. Powerful UV screening protection for gel-coat fiberglass, vinyl, vinyl awnings and graphics (stripes), tires, EPDM rubber roofs and seals. Spray on/Wipe dry. Treated surface repel dirt, soiling and staining. Nontoxic and environmentally safe."
Let me know if you have any questions and feel free to call me.
Jake JonesAdvanced Composites, Inc2575 South 3270 WestSalt Lake City, UT 84119