And I did find the flange. It extends up from the bottom on centerline about 2". Both hulls had cracks that were on the outboard side of this flange. The first hull has a 1/4" gap bound by the flange on one side, the outer hull on the other. So I stuffed black foam (eps?) about an inch into the crack to make a backing for the epoxy.

I bought a strip of 9oz tape, cuz the hardware store doesn't have chopped strand or milled fibers. That would have been my choice for a filler, according to what I've read. So now I can cut off a piece of tape and stuff it into the gap, sort of accordian style, then pour in the epoxy. If I do this, would it be best to thicken it with silica filler, in case the foam backing fails or absorbs too much?

The other idea is to cut up the tape into small pieces, making a chopped strand immitation.

I'll have the blower going for 12 hours straight and will tackle the gap/crack epoxy in the morning. Then 36 hrs after that, I'll lay up the knytex. Which reminds me...

So far I've gone easy on grinding down the glass where the tape layers are to go (not the crack/gap repair). I've got the gelcoat and a bit of the resin/glass removed for about 2" on either side of the skeg. On the one hand I'm afraid of taking off too much, making a hole. On the other hand if I don't take off much more than the gelcoat, it would be hard to make a smooth transition from the new to the old, right?

Cheers,
Danno

PS: pic here is of the first hull w/ 1/4" gap. 2nd hull I was more careful and opened up the crack about 1/16" by hand sawing it (coping saw?). Plan on squirting epoxy directly into crack.