Hi Shaun,
I didn't use fibreglass in the joint. I simply cut a triangular section off a strip (45 degrees, nocked the back in the tight curves to get around the bends, glued it in place, then covered with fibreglass. Its strong enough to sit on, support oneself on etc. Hasn't broken in three years.
JohnK

You guys seem like you have been bored the last couple of days, so I guess
: I'll ask a question.

: I'm about ready to glass the deck on a 14' great auk. First I need to put a
: fillet around the coaming lip. I saw Nick using glass yarn, some people
: just thicken up epoxy... I have a large container of elmers "wood
: filler" and was wondering if I could use that. It matches my wood and
: dries hard, but might end up a little brittle. Are there any other simple
: ways to make a fillet, I'm looking for a simple method... and I don't need
: it to be clear.