Gel coat is the outer layer of the fiberglass layup that is applied to the mold during the fiberglass part production process. It can be polished to a reasonable gloss and can last for a while unpainted, but most people find that it will oxidize and dull after a period. You can then either repolish and apply some kind of protective coat, or paint. Gel coat is not something that a dealer could apply. Now, some kind of gel coat protection they could apply. It's basically just polish and wax coat, I wouldn't bother with that if it costs more than a normal buff and polish job.
Brian
