It isn't necessary for strength and epoxy is the densest component of your boat.

: Thanks to all of you who post here, I had the confidence to go a
: little crazy with my first build, and it got out of control.
: Long story short, I'm building three boats at once (two 14 ft
: Auks and a Guillemot). I survived the hull and deck exterior
: fiberglassing, and now I have a question. Apologies if it has
: been posted in a previous thread. Do most people just do a
: wet-out when glassing the INSIDE of the hull and deck, or is a
: fill coat reqired too?