Hunter,

I painted the interior of mine... partly to hide the epoxy tape seams and other ugly areas.  Used an exterior oil-based paint in a color that'll compliment my exterior scheme.

I painted the cockpit and both cargo areas before the deck was installed.  Left the ends unpainted 'cause nobody will see them.

Good luck,

Larry

I didn't do anything except for the coaming on mine. The theory is that I store it indoors away from light between uses, and when I'm using it I have my big opaque butt and a sprayskirt blocking off the sun. I also have a cover on it when I'm transporting it.

If you want to be extra safe, then  yeah, several coats wherever you can reach.

Laszlo