This may not really fit under "skills", but....I've got two boats, a Nova Craft Pal (tuff stuff layup), and Curtis Nomad (Kevlar). The Nova Craft is 3 years old, the Nomad around 30, but both have always been stored indoors, so there's no UV damage to the gelcoats from sitting out in the sun for seasons at a time.
Both have gelcoat exteriors, both have a few rock scratches, particularly the Nova Craft. None are deep enough to make me think that resin (or whatever) gelcoat repairs are needed, but what do you do for general maintenance? Ages ago I used to put Turtle Wax on another boat I had maybe once a season for whatever good that did.